There are a few easy to follow steps. First, your vacation rental manager provides you with initial access to MyConcierge, which does NOT require a user login to view and select any of the activities.
Once you decide to book an activity, you will be asked to create an account.
There you will enter your email and create your own password. You will then receive an email requesting you to confirm your registration. Once you click on the confirmation link, you will be taken back to MyConcierge, where you will have access to your Itinerary.
Once you're logged in, you will see your name appear in the upper right area of MyConcierge, along with access to your My Itinerary & My Invoice, which will be created once you have successfully booked and paid for any activities.
If you decide to access MyConcierge from another device - simply make sure to click on the link your vacation rental manager sent you, then, select "Login" in the upper right area of MyConcierge to login.
The actual registration page is found here.
Note: In the screenshot below, if you are registering for the first time, you would click on the "Don't have an account? Sign Up" link below the login box.