If you are wondering how to attach a signature (a picture that appears under your posts)
Then you need to:
1) Go to "Profile"
2) Click "Signature on the top right
3)Then at the bottom you will see "Edit Signature"
4) If you want simple text, tipe in whatever you want then click save
5) If you want an image on then you will need to put the URL of the image between
6) After you have finished your sig, go to "Preferences" then scroll down to "Always attach my signature" then tick yes
7) Then your posts from then will have your signature on!