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Start by going to your User Settings in the upper right
Then select Account setting on the left side
About halfway down the setting select to show signature. Then click on the Edit Post Signature, enter the information in the box and save the Post Signature.
Finally, do a Save change in the lower right
Then select Account setting on the left side
About halfway down the setting select to show signature. Then click on the Edit Post Signature, enter the information in the box and save the Post Signature.
Finally, do a Save change in the lower right