Synapse….  Modules…. Available Modules….  Choose Macro

When installed it will appear on the Top Menu bar

Go in there to write your Macro and Bind it to the relevant button

Only via Hypershift function - but you need to assign one button to hypershift function. Then change your “layer” from standard to hypershift - bind function/macro to specific button.

Then you’ll need to press hypershift + your button to activate the function.

You can Bind a Macro to Standard Mouse Keys 6 and 7.  At least I managed to do it with my first attempt, given my Razer Keyboard and Mouse only arrived today. I am new at this, I could be wrong, perhaps.