Note that if you change the game client resolution or interface scale you will need to remake your custom release.bmp
Release a pet to have the Release window displayed.
Take a screen shot of the game client with the Release window visible. You can use the Print Screen key.
Open MSPaint and open or paste your screen shot.
Use the Magnifying Glass Tool to zoom into the Release window.
Use the Select Tool and select only the Ok part of the button.
This is what the release.bmp should look like:
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Quick start
Create release.bmp
Create charge.bmp
Create unidentified.bmp
General
Hotkeys
Taming
Music
Healing
Hiding
Fishing
Offensive
Lockpicking
Item ID
Harvesting
Custom
Custom hotkeys