I've searched after havin' pushed on "My account" button and haven't found anything.
How adding a signature?

When you post or respond to a post, you will see a link, just above the "Preview" and "Respond!" buttons called "Formatted Text Signature", click on that and you will see a text entry field, enter your signature there...please ensure that you follow all the guidelines for signatures in the WAFF rules...

http://www.network54.com/Forum/670704/thread/1287342606/last-1287342606/The+Rules+at+WAFF

...also please refrain from posting in the various forums just to test your signature out, we have a forum solely for this purpose...

http://www.network54.com/Forum/600260/

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"When we remember we are all mad, the mysteries disappear and life stands explained."
Mark Twain