Need to know the combination to use F24 key, tried Fn+F12 and some others didn't work

Just bought a Mac with WIRELESS Keyboard and having problem with finding a combination of keys to get F24 function.

have to jump back and forth between Windows laptop and mac only for these reason.

Use this function key all the time to get ot of any menu i am working on.

Help in this matter will be much appreciated.

Thanks