Account Administrators can invite new users to their Upsign account by from the Users section of the account settings areas.
Invite a new user
Navigate the account settings area
Choose Users from the left navigation
Click Add to add one or more users
From the Add User dialog
Add user email address
Choose access level
Optional: Create a new user group by clicking Add New Group, naming the group and saving.
Optional: Add the user(s) to an existing user group
Note: You can add multiple users at a time by separating each email address by a tab or space. However, you will only be able to apply a single access level to all those users. If you need the users to have differing access levels, you'll either want to add them separately or add them and modify their access level after adding.