 To register or activate Sistweek anti-mower, click on the top right corner of the main screen, you will see the activate button. A new window will open to enter the license key. Open your registered mail ID. In the search bar, find a mail name Sistweek. Here you have the reference number and your registration key. In the new window that opens, copy and paste your license key and click on the register now button. The product will be registered. Now run a scan and fix the detected infections in your Mac. For more information or questions, please email us support at Sistweek.com