Hi - your user ID does not have security permission to open the relevant maintenance window to complete the Multicurrency setup.
To open the maintenance window, click on Microsoft dynamics GP >>Tools >> Setup >> Financial >> Rate Types. In here you need to select in turn each of the FX Tables assigned to the company you are logged into. As each table is selected, on the bottom left of this window are the Rate Types that have been set up. For simplicity - insert all available rate types into the right hand box.
If you can't open this window -i,e. you get a message saying you don't have permission - then you need to get the system administrator to log in and do this for you - or ask them to grant you security to this window.
Ian.