Replacing Empty Genre Fields with a new Genre

Love this program, but I need to figure out how to replace empty Genre's with new ones. For example, I have 200 mp3's with nothing in the genre, and I want to insert "Country". I don't want to type this 200 times.

Load all files into mp3tag
Filter for files that have noting in GENRE:
Press F3 to open the filter section.
Type in:
%genre% MISSING
You should no see only files that have noting set in GENRE.
Press Ctrl-A to select all files.
Go to the Tag Panel (usually on the left) and navigate to the entry field for Genre.
Enter the genre.
Press Ctrl-S to save the changes.
Wait for MP3tag to write the modification.

THANK YOU!!! :w00t: