Cant access the server in pgAdmin localhost 8888

I think I did everything you described in the repo and then I went to localhost 8888 and logged in with the right email and pasword and the when I wanted to access the server / database it asked me this:

Please enter the password for the user 'postgres' to connect the server - "postgres-container"

and I entered the password I specified in the yaml but it says just this:

connection is bad: Name does not resolve