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Welcome to XOOPS
in the center of your page you will find the moduleĀ“s contents so you have to install the module(s) you like to use. f.i. a picture gallerie (in your case).
Go to the Module Repository (you will find it in the left site of this page)and look for what you like, download an install the module(s).
More ideas how to to: XOOPS FAQ (link also in this page)
Have fun
in valid code we trust