From your side menu, tap "My tags".
From your 'My tags' screen select which Task categories you are wanting to be alerted about.
From this screen you can also edit your location and the radius of which you would like to be alerted about Tasks under the categories you have selected.
Remember to tap the 'Update my tags' button to save your preferences.
To control what notifications you receive from MyTask and how we notify you, you can also edit your notification preferences.