See in the upper-right corner where it says TMK / Fungi Forums? Click where it says profile. Then type in your user name and password. There you can edit your info and can make/change your sig. Submit it and there ya go!
BTW, if you have any ' in your post, it'll change to a ". To avoid that, go to Word and type a '. It should change to a smart quote. Copy-paste that into your sig. ;)
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Deep inside us all is a little green elf telling us to burn things.