after the install of your server you'll get your admin pass and superadmin pass
make sure they are copied and saved correctly.
there are 2 options in the administration panel 1 normal admin and 2 superadmin
just use the admin id+pass to log in and make another id+pass you will not forget.
do the same at the superadmin section.
i got sometimes problems with the superadmin at the first install too just delete and re install (not deleting the server will hold your options

)
superadmin only works with special clients so use the normal admin id+pass to log in with your normal client