You have a couple options!
The most common is to hang onto those dollars until the next market day. Market dollars, or the dollars you withdraw from your QUEST (EBT) card, can ONLY be spent at the market you received them at. Matched Double Dollars, can be spent at any market that participates in the Double Dollars program.
If you don’t spend all of your dollars and do not want to hang onto them until the next market, you can return them to your card. For every market dollar that goes back on your card, you must return each Double Dollar match you received.