Hi.
did you try to open the help/about? maybe there is an option for registration.
another way somtime is in tools/register.
or another way somewhere in the help menu again.
there is a posibility that there is no such an option for that kind of program - maybe it is shareware or a trialware, so you need to find a retail version of this program.
but still - all i sad are only suggestions and options, because I don't kno the program actually.