The first contact will be your request to get an account for using the Hg database.
The Hg DataBase site is currently in beta test.
After the beta test it will be possible for users to apply for a user account. You will just have to enter some user data including your valid email address. Then if you are approved as a user, you will get a password in your email.
For the most keen persons it is possible to preregister here.
You may preregister to get a first glimps of the Hg Database site.