Is there a limit to the number of Roles I can Signup to?

If the Opportunity Manager has put a min/max on the Role selection step there will be a limit on how Roles you can select.  If the Manager has not put a min/max on  Roles you are free to select as many Roles that you want to participate in. When the Role selection step is enabled you will only see Shifts for the Roles that you have selected.