How to remove an album from my iPhone?

I know that to delete an album originally imported from my computer i have to uncheck on iTunes, but the thing is that i don't even have the folder on my computer anymore so it doesn't give me the option of unchecking it. So I can't take it off on the iPhone or on iTunes I don't know what to do. I Really want this folder off my phone, help.

Added (1). So sorry I just realized I completely forgot to say that I meant a PHOTO album, not a music one, sorry that it lead to confusion I know how to remove music albums, but when a photo album is from the computer you can't delete it straight from the phone you need to go into iTunes to take it off, but like I said before I don't even have it on my computer anymore so it doesn't give me the option to remove it, so if someone could help me with that I'd appreciate it.

You can take it out on your phone! Just go to music > press 'albums' at the bottom> over the album you want to delete and slide your finger to the right