There are two ways to do this:
1.) Use Vyper’s pre-made actions.
2.) Create your own custom bonus actions.
Here's how to do both:
1.) You can access both by editing your campaign and at the bottom clicking on Bonus Actions.
2.) Click on Add New Bonus Action.
3.) The 1st method will be at the top. Here you can click or hover over each pre-made action to see what each one does and add them.
3a.) If you want to make your own custom action, scroll down and fill out the template. Once you're finished, click Create.