If you have connected your Zoom account to your bamboo account as a Professional, when you are setting up an activity you have the option to choose either "Zoom" or "Free-text" for the location. If you choose Zoom, a Zoom meeting will be created one hour before the activity begins and will automatically be sent out to you as the Professional and to your participants in your activity.
Check your email to find the links and join your activity. Another option is to visit the activity page within one your of your activity, and the Zoom link will also be available there for you as a host and for your participants to join.