Click on the Campaigns tab in the top header to list all of your campaigns. In order to share a campaign click on the three-dots icon and click on Share campaign. A link to share your campaign will be generated automatically. You can also share a booking link to get people to book appointments directly into your calendar.
If you receive a campaign link you just need to login to your account to get the campaign into your campaign tab. If you don't have an account you will be able to create an account to get the campaign.