To check rankings on YouTube, specify a link to a video or a channel when you create a project and add YouTube as a search engine.
To check YouTube rankings in different locations, change a language, not a region (it always would be Global). Due to technical reasons, there are no locations on YouTube. To check rankings of a video or channel in different locations (with different languages), create several projects.
To check rankings of a video, specify the link to it when creating a project, for example, https://www.youtube.com/watch?v=RsCtECtr‑sY. A short link with the youtu.be domain won't work!
To check rankings of a channel, specify the link on it when creating the project. If you specify a channel, robot will search for both the channel itself and any videos from it in the YouTube search results. The channel must have the link that looks like https://www.youtube.com/@google