That was the first thing to cross my mind, but how do i find the slot where i can edit my signature??
computers is not my thing

Here ya go a quick tutorial:

Click on the UserCP on the to left navigation bar. On the left hand side is the settings and options, click on Edit Signature, a box will open and to start just click on the and just add your URL and click save and your done.

You can get more advanced, by highlighting the text and click on a color to add color.

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