If you would like to change a user's role in the Q&A process, you can change the user's Q&A role. If you would like to stop new questions from coming in be advised to set a question limit in Q&A settings.
Step 1: Select the user(s) you would like to change;
Step 2: Select Change Q&A role;
Step 3: Select the new Q&A role;
Note: In a single user role there can only be users on Question or Answer side.
Step 4: Select Save.