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Go to the Administration page of your XOOPS installation, go to SYSTEM ADMIN | BLOCKS. Scroll down to the bottom of that page and you will see a section to add a new block. Just set the position of the block, the weight, give your block a title, create a menu using html (check off the box that says the type of content is html), set your cache time and save it, and you're good to go as far as the block goes. Make sure you fill in all the fields approp.
Remember, after you've made that new menu, you also need to go to the groups section of SYSTEM ADMIN and give permission group by group for the groups you want to see that hot new menu. I hope that I understood what you wanted correctly and that this helps.