Check your order email, it includes the assigned Product Key for the license you subscribed.
In case you wish to use it on the same computer as the trial version, simply go over the license activation wizard again in order to couple the paid license to this machine.
If you want to install it on another computer, use the Product Key and downloads link provided in the order email to install and activate as described here.
Remember, each Product Key can be used on a single computer. If you need to move computers or experience any issues, send us an email at firstname.lastname@example.org.