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Ummm... XOOPS has nothing to do with FrontPage. It's a software you install on a server, and then run to manage a site. You can use any editor, say FrontPage, Dreamweaver or even Notepad, to change code if you need to, but it's not mandatory. We can only tell you how to install, run and manage users in XOOPS:
http://xoopsdocs.net/modules/docs/en/xn-001/online/index.html