I don't have the option to change the tempo for some reason. When I go to it on settings it just looks like this and I can't click on it. Does anyone know why or how I can change it so I can use it?
Looking at the image it would appear that you are using the free version of Music Maker - if so the feature is not available in this version and I would advise you to buy the Premium version rather than add Soundpools, Instruments and Features piecemeal the cost will be lower.
Can you also remove you email address (and serial number if visible) from images when you post them in the forum, this will prevent spamming and potential hijacking of your product.