Yes, you can do that on the Team settings page.
There are three types of users you can invite to Bïrch:
A user with admin privileges has the same access as the owner does.
A regular user has access to the platforms and the features according to the permissions you grant them on your Settings page.
A client doesn't have any access and can't see anything except for notifications from automated rules and reports on their email.
Having trouble inviting your team member? Check out this article to get detailed info.