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Have you set group settings in Admin for permissions for different groups??...
Admit that the Doc's are hard to find and exist across the net, with many of us making them as Xoopers indervidually and as well as the whole...yet they do exist all over
Xoops Admin is a good start...you seem to be missing out a big sections of reading up on things, like setting of blocks admin, groups admin...yet none of these are hard; why i like XOOPS my self, as it is simple to use, just experiment
Else we will be chasing around explaining stuff that much of it is within settings and understanding the admin
Plus looking for latest revisions via Google as often the site might be in Japanese, French or many of the other XOOPS resources ....which have fixes and updated versions, yet with English langauge normally also...