We took the "off feed" sign down for a little while, I feel like such a rebel.
I feel like such a rebel.

I don't know why "a rebel" used in this sentence, feel afraid to conform it?
What's the meaning of the rebel in this context?

Question

We took the "off feed" sign down for a little while, I feel like such a rebel.
I feel like such a rebel.

I don't know why "a rebel" used in this sentence, feel afraid to conform it? 
What's the meaning of the rebel in this context?

Answer

It implies that the speaker doesn't have permission to take the sign down--they feel like a rebel because they're doing something forbidden.  (Sort of like saying 'ooh, I'm so naughty!')