To view available missions, open the š tab and hit the arrow in the bottom right corner to locate your location (geolocation will need to be turned on for this). Hit the SEARCH THIS AREA button until it shows ALL LOADED. Toggle between MAP view and LIST view from the top of the screen.
In MAP view, filter the pins by hitting the button in the bottom left corner. This button is on the top right in LIST view.
For information on different mission types, read here.