Go the top of the page , on the second blue bar down , on the left hand side click on Control Panel , then on the next blue bar that comes up click on edit Profile , scroll down until you get to Signature , fill that out like you would do a post.
You can also add contact features such as email address so that people can click on the little boxes under your name to send you an email without being spammed like you might if you just posted it normally.
Hope I've helped - if you need any other info just say the word.
DX : Bipolar , Panic Disorder , GAD , OCD , IBS.
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