Go to: Assign, then click on “From Scheduled List” (or “From Unscheduled List”)

Click on the name of the desired shift (or activity)

In the Filters section, check the “On the backup list” box Scheduling option

Select other filters, as appropriate

Click the [Search] button to display volunteers on the backup list for that Activity

Click on the [Assign] button beside the volunteer you wish to schedule, or check the boxes beside multiple volunteers and click the [Assign Selected] button at the bottom