If you have a role in the Q&A, you can see your Q&A role in the top right box in the Dashboard.
If you click on the Q&A module on your first time use an onboarding wizard will start and will let you know which role in the Q&A process you have.
You can always restart the onboarding by clicking on Start tour in the Q&A.
Click here if you want to have a look at the FAQ about Q&A.