In order to link your FaceIT, you need to choose CS:GO game on the top and follow the next steps:
1. Go to "Settings".
2. Choose "Player" tab.
3. Press the button "Link your FaceIT account". After that you'll be redirected to FaceIT login page.
4. Login to your FaceIT account and press the button "Approve".
5. If all was done correct your FaceIT information will be added to your dreamteam profile. Press button "Save"