You should be able to download/install razer synapse.
I assume your mouse has extra buttons a normal mouse doesn’t like buttons on the side or something.
When your in synapse you just click “macros” tab then type in a name for the macro and set the delay to whatever the GSE script recommends. After that you hit record and hit “4” or whatever button you plan on using for your macro on your skillbar. After that the macro should be made, then you click on the mouse tab and their should be a bunch of options with a picture of your mouse and all the buttons labeled 1-9 for example, their will probably also be a “side view” if your mouse has side buttons.
I use a Razer Naga Epic Chroma so I have 12 buttons on the side.
You basically select what button you want to activate the macro, click the box, then on the menu that opens their will be a drop-down menu, select macro from the list. After that their will be an “assign macro” that’s where you select the macro that you made earlier.
Then in playback option you select “toggle continuous playback using assigned key”. Then you hit save and you should be done.