Sammy, have you tried looking at the BBCode help guide?
In the forums here, bottom left corner where it says "BB Code is on" you can click for a reference page to the commands, and it gives examples.
Here is the link:
BB Code Help
How did I do that ^^^^^^ ?
I typed this:
[url=http://www.piratesonlineforums.com/forums/misc.php?do=bbcode]BB Code Help[/url]
Legend:
BB Code Tag
Target URL
Displayed Link Title
To answer your question more precisely... your sig code would look something like this:
[CENTER]
[img]yoursig.png[/img]
[url=<url#1>]URL Title 1[/url] - [url=<url#2>]URL Title 2[/url] - [url=<url#3>]URL Title 3[/url]
[/CENTER]