I have problems with my signature

[Kauno-Uolevi]

I am sorry, if my question is stupid, But I don't know how do I figur this out.

I try to add a link to my signatur. I thinked that I can use a [url] tag, and the counter says that I have 6 caracter's left. Then, I veiw my signatur, and it look's that it has removed caracter's from it.

But it says that I have caracter's left! ???

Thank you for you're help.

[Kauno-Uolevi]

I am wery sorry if this my qestion is stupid, but can somebody help me? I like to have my link in an signatur.