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Hello and welcome to Xoops.
It would help if you provide what version of XOOPS you are using. The extended modules came bundled with XOOPS 2.2.3, you should have installed it when you installed Xoops, if not, then under Administration, click on the install icon by Extended Profiles.
The XOOPS FAQ section provides helpful instructions on using Xoops. You can find it here:
https://xoops.org/modules/smartfaq/
Dana