Sharing models is easy.
Even if you haven't created your own floorplan or model they can be easily shared by simply adding Team Members to a model (see How to Share Models).
Once shared, you will have received an email Welcoming you to RealAR, with details of how to download the App, and how to login at app.realar.com.
For New Users, click Don't have an account yet? click Sign up located just under the login box - make sure you use you email address that has been shared (this will be in the Welcome email), add a password and click Create Account.
If you Already Have an account, simply sign back in using your regular email or Google account. Use Reset your password located just under the login if you've forgotten your details.
Related articles: How to Share Models and Troubleshooting Login keeps redirecting.