You have a contact in the People module that you want to create as an active user in ChurchDesk? 

All you have to is to click on the contact's name in the overview so you get to their profile overview. To the upper right, you will see a button that says "Create as a user". 

You will now be guided through the process of setting up a new user as described here (starting with the third point under "Create a new user"):
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