To update your Match Preferences, make sure you're on your Home
Your Match Preferences are located at the top of the page
To access Preferences, click on the edit pen within your Match Preference box.
All the specialties that you tagged in your work experience will populate here.
From here you can:
Add new specialities by using the search bar
Click the toggle next to each speciality to either turn them off or on
You will not get Matches for any specialties that have a greyed out toggle. You will only get Matches for specialities that are blue as pictured below.
Be sure to save any changes you make by clicking the 'Save' button in the top right hand corder!