How do i edit a feedback I have left? They are not giving me the option to make an edit.

[sw33t23]

Hello,

I've left a feedback that I want to change.  There doesn't seem to be a way to edit it.  Can anyone help? How come I can't find email support on this platform.  It's so hard to just find answers to basic questions. 

[plpmr]

the neg you left is too old to revise.