New user, help with basic tagging

using the program for the first time, probably a stupid question for a basic thing, but I can't figure it out (and I read the help first)

My problem is the following:

Please tell me how to fix this issue, which appears on multiple files.

thanks in advance

For your format string use:

%artist% - %title%

It worked. I knew it was going to be simple. Thanks guy!