Looking for New User Help

[ohrenkino]

I think the HowTos and FAQs would be a good source just like help

First Steps – Mp3tag Documentation

Actions and batch-operations

How to create a new action? First, create a new action group via Actions > [Actions] Actions or Alt + 6. Then, click on the button [New] New and give your action group an expressive name, e.g., "All tag fields Upper Case". This action group can be applied to the selected files after you have added one or more actions to it. Now, you can create a new action in your action group via the button [New] New and choose the desired action type from the list. At the moment the following action types …

The help would also show you the list of actions where one is called "Replace":

Replace – Mp3tag Documentation

In this action you can also set how to treat upper/lower case.