Depending on the rights that are given by the administrator you will be able to invite users.
There are three different roles a user account can have in Driff:
The administrator can adjust the rights of each employee group via company settings -> security settings. For more information please click here.
If you have the rights to invite guests, you can do so via the creation of a Hub. Start a hub, add them as guests and they are automatically added to Driff.