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Well it depends what type of sig they are making. You have
[url], [img]
and others. they are all contained in square brakets and closed like
[/url], [/img]
My sig for instance looks like:
[ url=http://www.warpigw2.com]WarPigW2.com : Technology : Security : and Fun[ /url] 8-)
[ url=https://xoops.org/modules/smartfaq/]Check the Faq[ /url] |[ url=http://www.warpigw2.com/modules/wfsection/]Xoops Tutorials[ /url]
I had to put an extra space in the tags for it to show.
HTH.