You'll receive an email notification if you've been invited into a package. An account will have been created with your email address if you didn't already have one.
Select Get Started in the email to create your password.
Create a secure password that meets the indicated requirements.
You'll be logged into your account and be brought to your dashboard. It will look much like this:
For future logins, use the Login button on the top right corner of www.domecile.com