Install the extension for each browser you want to use with KeeForm. You will be redirected to an external site.

Edge users: first enable Allow extensions from other stores in Edge Settings → Extensions.

If KeeForm stops launching Edge, disable Startup Boost in edge://settings/system.

After installing, make sure the extension is enabled — KeeForm shows a green indicator when everything is working. From now on, double-clicking an https URL in KeePass opens the browser and fills your login automatically.