Reassigning keys on MS Office keyboard

I have a new Microsoft Office keyboard. Many of the keys can be assigned different uses, but I'm not sure about the four keys at the top of the numeric keypad. I want to change the equals sign to Insert - they are both the same key, but the default is the equals sign. If I set the F lock all the functions keys are changed and I only want to switch that one. Can this be done? Easy language, please...

 

Okay, I've found a solution to the problem, so although I'd still like to know if I can reassign just one key in the numeric keypad, I've got at least a working solution.