Hi @watermelons, thanks for your message and sorry to see you’re having trouble with this.
If you’ve installed your free license key, we should explore the chance a plugin conflict is breaking the JavaScript on the page containing the button.
Double-check the browser console for red errors that might hint at issues on this page. The best way to test is to run Wordfence as your only enabled plugin and also reverting to a default theme such as Twenty Twenty-Three. If you are able to activate the firewall, then reenable your plugins and theme one-by-one until console error messages return on this page to help find the cause. However, if you’ve already been able to enable it during these tests, the firewall should stay enabled.
Let me know how you get on!
Peter.