How to change hours of availability on mcdonalds metime?

Is there a way you can change your hours of availability on the mcdonald's career website "metime"?

Answer: 
Hi, No you can't you have to speak to your rostering manager. They need to check to make sure it's not a massive difference in hours (such as going from being available six days to only being available one). The rostering manager also needs at least two weeks notice to be able to apply the changes.