If after installing the program and running it, the program doesn't present a registration screen then you are fine. There is nothing to do. This means that as far as your installation is concerned, your installation is unlocked and it will not time out after the 30 day trial.
There are two ways this can happen. It happens when you previously unlocked an installation on this computer and never removed the registration. This, for example, can happen if you install the program, unlock it, and uninstall the program. Subsequent installs will think they are already unlocked.
The second way is via an automatic unlock.
What you can do to alleviate any anxiety is to verify the expiration date in the upper right-hand corner of the MAIN MENU is correct. If not then you'll need to request a new unlock key.