Tighten chain

With 12 months of use, my chain is becoming loose. I loosened the bolts yet the wheen doesn't move so that I can tighten the chain. How do I do this?

Hi Michael, You can follow our front tire tutorial here halfbikes.com/halfbike-3-front-tire-replacement

THanks: "Use a slotted screwdriver to rotate the elliptical washer in both directions until the chain becomes tensе"