Goto OPPORTUNITIES & PROVIDERS > OPPORTUNITIES and click on the OPPORTUNITY INFORMATION icon. Then you can change the DBS or INDUCTION STATUS and click UPDATE.
If you change an opportunity to require a DBS or an induction when volunteers are already committed to the opportunity the system will list any volunteers who do not comply with the new updated DBS or INDUCTION status.
These volunteers will have to either be removed from the opportunity or be inducted to comply with the DBS and INDUCTION status before the opportunity details can be adjusted.