Why wont it let you know when someone post comments?

Why won't it let me post a comment on a certain persons profile ?

How long does it take for a comment I posted to go on the site?

I want to know how do we know when someone leaves a comment on our picts..or how can I check which ones have comments without...

Do you know if there a way to know when someone has commented your picture? (Besides the friend update thing at the side) Or ...

Why wont it let me give advice to anybody? is there some thing wronge with the system?

How do I send a comment to someone who answered my ?.

Why wont it let me edit my own answers/questions/comints?

Does anyone know to find someone on here ? I want to say thanks for the advice.

Problem is it won't let me go to choose the photo I want! Ahhh. They are all appropriate so I don't know why it no work

I dont know why comments are disabled in my picture somebody knows how can I change that any answer is welcome thank you.