How to delete photos from my photo library on an iPhone 4?

Hi everyone well i have photos in my photo library and i want to delete them but the photos are not deleting. Like if i click that bin thing on the bottom right corner when i click on the photo if i want to delete it, it won't do anything. I don't even know how the photos were put in my photo library but i really want to delete them. They're just random photos i had from like a year ago but i can't get rid of them. I've heard if you sync your iPhone to iTunes then you can delete them but well i don't know how to sync my iPhone like when i plug it into the computer it doesn't automatically sync so if you know how to sync your iPhone could you please comment that too. I know there's an option under 'Photos' and it says 'Sync photos from' and then it says like choose folder, but what do i do from then? I hope this is not confusing what my problem is, but if you know how to delete photos from your photo library from an iPhone 4, can you please comment below how to do it. The photos are just a waste of storage and they're not important so it doesn't matter if they are permanently deleted.
P.S i have updated my iPhone to ios7.

Does the iPhone 5s and 5c use the same case?

I just got the 5C and i need to buy a casa as soon as possible but websites only say "case for iPhone 5s" and nothing about the 5c. I don't want to buy one online and end up having to return it because it doesn't fit.
so does the iphone 5s and 5c use the same cases?

Just need some clarifications?

Ok so i started working as a cashier. And i had a supervisor who helped me get the hang of it. You know the first days of work is scary and he was totally supportive and made things seem not so bad. And we started small tlk nothing big. We were working and i was overwhelmed. He winked at me telling me that hell help me out. And it got me. I turned around and laughed. In my head i was like omg. Then i started to like him. We tlked a little but more when i was done with my shift. We just tlked about iphones cuz i had one n he said he repairs them. He was just telling me about what he repairs and thats it. He found out that i had one cuz i was bymyself at lunch using it. I have a boyfriend of 4 years. But i guess i have a crush on my supervisor. I'm 20 and hes 28. He looks young tho. And everytime i see him i get nervous. I don't want to like him. Its not that big of a deal cuz i don't want to be with him. But I just keep my ddistance. You think he likes me? How can i aviod him?

I can't text another iPhone?

I have an iPhone 5 with the ios7 update. When I go to text another iPhone it doesn't go through, even if the iMessage is off. Neither work! But I can text other phones! My sister is on my plan with the same phone and she can text iPhones? Is my phone just defective!

What are you not able to do if you don't download iOS 7?

I'm getting my new iPhone tomarrow in the mail. I have had a couple iPhones before so I know a lot about them except for one thing. If you keep iOS 6 on your phone, are there restrictions about having it? Will you not be able to do certain things that you were able to do before?

IPhone 5s lost:'! With iOS7 and iCloud account?

I lost my phone just 2 hours ago. What should i do? Would the person who finds it be able to unlock it? It's an iPhone 5s w iOS 7 I heard you can't unlock it and you can report it so thy can't use.

Why won't my new iphone 5 download my music when plugged into my laptop?

My old iphone 4 downloaded just fine. Normally I take the music I didn't buy from itunes and just "select all then drag and drop into my iphone folder thing on iTunes" and it would be added and it was easy for me to do this, is this now not working because I have IOS 7? Everytime I try to drag my music into the iphone place like I used to it just won't let me. What do I do?

Is waiting for the gold iPhone 5s worth it?

So last Saturday, Oct. 5th, I went to a corporate T-Mobile and upgraded to a 32gb iPhone 5s. They told me that I'd just have to wait two weeks for it. I said that I could wait for two weeks, but now I'm seeing that some people who ordered their gold in September haven't gotten theirs yet and that I would now have to wait until November to get it. Anyone know when it's really going to ship? If you guys ordered one, did you get it yet?