1. make a folder with your guild name or something
2. download all the addons/tools you want in your package and extract them all to that folder you just made
3. download a program like WinRAR. (google it) or other file manager program.
4. compress the folder that you made in step 1. (creates it into a .zip so you can upload it)
5. upload it to wowinterface.com!
hope this helps.
with WinRAR, the "Add" button compresses folders, fyi. make sure you make it a .zip and not a .rar
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