How do i give other users permissions for modules?
To adminster the permissions for a module navigate to  Administration » People » Permissions.  There you will find a panel where you can assign permissions for the various modules.  The section for the FAQ (Frequently Asked Questions) module is shown below:



As you can see, this module have three separate permissions:


Administer FAQ module
Administer FAQ order
View FAQ pages


To grant as specific role a permission, you tick the mark to the right of the permission and below the role.

In the screen shot above, all roles are granted the right to "View FAQ pages", but only the administrator is granted the other two permissions.