How to add userAdmin user in Mongodb Atlas

How to add a user with [userAdmin](https://docs.mongodb.com/manual/reference/built-in-roles/#userAdmin) role in Atlas? The Cluster Security "Add New User" UI https://cloud.mongodb.com/v2/.....#clusters/security/users shows only limited set of built-in roles without any option to enter role name manually: So I am a bit stuck here - there are no options in the UI, and non of the existing roles allow to add users in a shell. **UPDATE:** To make it crystal clear I went To "Security" tab in MongoDB Atlas cluster, from there I clicked "Add a new User", clicked "Show advanced options" and got the screenshot above. **UPDATE 2:** None of the roles in the list have userAdmin privilege. The most "powerful" [atlasAdmin](https://docs.atlas.mongodb.com/security-add-mongodb-users/#atlas-user-privileges) covers only: - readWriteAnyDatabase - readAnyDatabase - enableSharding - dbAdminAnyDatabase - clusterMonitor and doesn't have enough privilege to execute db.createUser() command.