Iphone won't delete pictures?

My iphone has pictures that my friend took with my ipad so now it is on my iphone so i deleted it off my ipad but it is still there on my iphone but when i try to delete it off my photostream (iphone) it doesn't even have the trash button! So when i go to my photo and i click on the delete everywhere button it won't even freaking do anything!

I'm sorry but I have no idea…

Go into your photo stream (where they are all small) click edit (top right corner) and then tap the ones you want to delete to highlight them, then the delete button will like 'highlight' itself when photos are selected, then just click delete. Alternatively go on to singular pictures and there should be a little trash can in te bottom right corner