I want to change my signature to have this is
http://forum.toribash.com/market_view.php?id=6770
and to make it say something like: My Shop.

how i do it?

Umm, use bbcode. It'd be
Bbcode is easy to use, just you need to learn how it works

Effect is
My shop

better?

Nah, you've got it as
[code[http://[b]http://*******.com/nw4ztt[/code]

Try this:

[URL="http://forum.toribash.com/market_view.php?id=6770"]My shop[/URL]

Just copy and paste it into your sig, no need to ******* it.