Go to "mouse" in control panel. Go through the tabs until you find a tab like this.
You can then make the buttons do whatever you would like. Just click the correct device (if you have more than one. Press "settings" and you should see some options.
If you don't have the option to do this, search for newer drivers
for your device.
When you click "settings" you may see something like this. This is where you will change settings for the buttons. Hope this helps.