Hey! I want to add another site, but the only way is via CORS. But here I do not know which password must be entered. According to this link (https://matomo.org/docs/manage-websites/) there should be a function, but I can not find it. Do I have to register separately with Matomo for this?
You never need to change the CORS header if you just want to track websites and doing so might even introduce security issues.
You can add new websites either by clicking the link at the bottom of the “all pages” or by going to the administration section of Matomo () and then either on Websites or Measurables.