Hm, okay. It's kind of long and boring, but here goes.
1. Right-click save it to your compie, somewhere where you won't forget where you put it. (Guilty!
xd )
2. Go to an image hosting site, like
imageshack or
photobucket, or just search "Image hosting" and post the piccy online.
3. Copy/paste the IMG tagline thing. It will look something like
[IMG]http://i6.photobucket.com/albums/y203/Evil_insomniac/Tales of Symphonia/Kratos51.gif[/IMG]
I think. (It actually looks like this:

!)
Test it to make sure the link isn't broken as well.
3nodding If you need help, just PM me.
@Kratostheangel:
Do you have like a slogan/motto/type thing that should be on the siggy besides just the name of the guild? And do you think you could send me those pictures? They're cool.
3nodding