Query foreign tables between a post and a user

I have a posts table connected to the user who created it through uuid. How can I select posts and also get user information?

I have something like this:
const test = await subase.from("posts").select( *, users( username ) );

but it always returns the message "Could not find a relationship between 'posts' and 'users' in the schema cache".
How can I retrieve user data from posts table?
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