As a Tasker, you will first need to complete your profile and add the Task categories / services that are within your skillset.
It is best to have your Notifications switched on at all times! Turn this setting on from within your Settings menu (hamburger menu in the upper left corner of your app).
The radius for jobs that will be listed for you is variable. The default setting is a 50-mile radius, but this can be narrowed under the Explore screen. If you select the "Refine" button, you can narrow your search radius for jobs and for notifications.
If you have notifications switched on you will be informed (via a push notification) of all jobs that are within the radius you selected of your default location.
You can also search for tasks by selecting the Explore icon at the bottom of the screen and clicking Find Tasks.