i can't make them visible for them.. how can i do this?

and second question.. i made some changes on theme.html in template directory (i e fiblack) but i cant see the changes on my home page.is it normal?

Your first question see this Faq Page

And this Faq Page

For the second question see this

Faq Page

Hello and welcome to XOOPS forums

To make a module or a block visible, you need to do as follows:

1- for blocks... go to admin> system admin>blocks page
2- Find the block you want to make visible
3- Click the visible radio selector and set its position
4- Click update at page bottom

5- Go to system admin> groups
6- Click the group modify link for the group you want to see the block
7- Find the block in the position you selected in blocks
8- Click the checkbox and update the page
9- Repeat for any other required groups.

For modules:

1- Go to system admin>groups as before
2- This time for each selected group make sure you select the checkbox for 'module access' in the top section of the page and update the page again as before.