To add a contact to your venue, first head to the 'Contacts' module on the left side your admin area:
Select the '+ Add new contact' button in the top right corner. This will bring up the below overlay:
The first and last name are compulsory fields. Selecting 'Submit' will add the contact:
Use the 'View profile' link to be taken to the contacts profile, where you can edit, email and invite the contact. Please note the contact will have to be invited in order to register with your venue.