2 steps in navigation drawer

Situation:

In navigation drawer, I can add a new role to the item. If new role added, next step is to assign the user. If the user is not assigned, the role is removed from the item list.

Problem: UI problem. Don't know how to do more intuitive user experience, as it confuses too much user.

Ideas how to solve: In the 2nd step add title not "Change role assignments" but "Title of the added role". The problem is that role can have a long title.

Question: Any ideas how to simplify this user interface while considering material design guidelines?

UI:https://media.giphy.com/media/9DnOucyE2cUF7dZODn/giphy.gif