To generate the roster “slots” for the weekly roster, you need to setup the Roster Preferences. Once the roster is generated the roster should something like the example below, the top image is in Member login, bottom image is the admin login.

Go to Members - Select Boxes - Preferences

select the Roster preference and click Edit. Or delete the row and create a new row(s).

e.g to change the Saturday time slot from 9.30-10.30am to 9.00-10.30am click edit for both the Roster and Roster Coord with weekday = Saturday.

change the time to 9.00-10.30am