Leave the beats per bar alone unless you want it changed.

If your song is multiple choruses and not 'unfolded', you have to specify which chorus to change. The default is all choruses. In your case, since you want 2nd chorus different, you have to specify that. At the top of the F5 window is a dropdown box. Select a chorus and make whatever changes you want.

For your song,...
- click on the 5th bar and press F5
- Select 2nd chorus from the dropdown
- Press the .STY button and choose the one you want
- Select 3rd chorus
- Press the .STY button and choose...

R