Go to the Options menu and select Preferences. Or press the keyboard shortcut Ctrl + P.
Winamp Pro is the top page in the Winamp Preferences tree.
Registered Name: Enter your Registered Name in the top field. This must be the exact same name you used on the registration form.
Registration Key: Copy and paste the exact Registration Key into the bottom field.
Submit Registration Key: Click to register. Say 'Yes' to any UAC Prompt (Windows Vista/7/8), if enabled. Note, turns into a 'Remove Registration Key' button after successful registration.
If it says "Invalid registration key", make sure you are using the exact correct Name & Key and there are no trailing spaces. In some cases, you might need to run Winamp in admin mode (e.g. by right-clicking the Winamp desktop icon and selecting 'Run as administrator') for the key to be accepted.
If the problem persists, you can contact us by using our Winamp Pro Customer Support form.
Q: The "Winamp Pro" preferences page is missing. I don't see it at the top of the Prefs tree.
A: The only way this can happen is if you've installed the Lite'N Winamp Preferences plug-in (gen_nopro.dll) from the Winamp Essentials Pack. Go to: Prefs > Plug-ins > General Purpose > gen_nopro.dll > Configure, and uncheck "Winamp Pro" from the "Hide" menu.