You have to have 15 non-spammed posts or replies and an hour wait. That Makes Egit Signature show up in your settings
Then you find one someone that has a banner that you like, and see if clicking on it will take you where you can fill one in yourself. (not all do that).
You fill it in, generate the BBCode, copy the BBCode
At ECF, press Settings upper right, press Edit Signature on the left
Paste the BBCode into the TEXT signature box, Save