Kamil if you go to your user control panel you'll see a list of links along the left hand side. The top one is to edit your signature.
You essentially create one the same way you post. Just type in what you want to say. You can use the editor to do the usual making things bold or changing the font, etc or you can type the code directly. The code is vBcode. Check the link if vBCode is new to you.
It's a good idea to preview your signature before you save it since it, but once you're ready just save it and it'll appear at the bottom of every post you make. You can always go back in later and edit it.
Hope that's enough to get you started, but don't hesitate to ask again if you need more help.
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