If you wish to give access to new users to your database you must be administrator of your Online Database.
1. Once connected to your account, select the database you wish to modify, and click on Users.
Online Database - Users
2. Select the option Add User.
Users - Add User
3. Enter the Email/Username of the new user of the database. You can, from that window, allow the offline mode option and also assign the rights for the new User.
4. You can now send an email invitation to the newly added user of the database, simply select the User and click on Invite.
Add User - Invite
5. An email will directly be sent to them with a link connecting to your Database.