Mcdonalds scheduling, please help.

I recently completed Mcdonalds orientation, and have been periodically checking the maxtel work buddy app for shifts, however in the 'my shifts' category of the website I haven't been assigned any shifts, I haven't gotten any actual training as the orientation was mostly forms and a tour, but on the website there is an open shifts section with open shifts, am I meant to take them or just wait to be scheduled into my shifts???