I mean like at the bottom of the text of whatever you post.

A) This is a duplicate topic. I'm sorry.

B) Well, to answer you, go to the main discuss page, scroll down to the bottom, and on the right, there is a link that says “change your signature” or something similar.

I hope this answers your question!

Scroll to the bottom of the main discuss page (if you don't see a list of people that are on scratch right now signature changing won't happen fast) and click a button named ‘change your signature’

Alright, thanks. I will do that.