1. go to openrouter.ai
2. create an account by clicking on "sign up" on the top right corner
3. after logging in, go to the home page
4. click on api keys (in the sidebar on the left)
5. click on "+ Add new key" button
6. copy the api key
7. paste it in the input field in the previous page
8. click on submit
the tutorial guy made it a bit complicated for dummies. you can follow it from 0:44 till 1:02