Go in to the Contacts screen and Edit a Contact (or Add a new one).
Go in to the Practitioner tab for that Contact.
Click on the plus to Add a Provider Number.
If they are a Referrer you should tick the Referrer box. (This can be applied if they are also a Servicing Provider).
If they are internal to your organisation (i.e. a Service Provider) also go to Companies and Link them there:
Then go in to User Management and set them up as a User:
