How do I register Sketch?
Launch the Sketch Mac app and click the Register Now notification in the top-left corner of the window. From here, you can select whether you’re registering using a personal license key or a Sketch for Teams account.
For personal licenses, select the Personal License tab, copy-and-paste in the license key from your email, and (optionally) sign in or create an Sketch Account for Sketch Cloud.
If you’re registering with your Sketch for Teams account details, select the Sketch for Teams tab in the registration window, enter your Sketch Account details and choose Sign In.