Single link in bike chain won't rotate?

Trish

New member
I bought a used bike and I noticed a problem with the chain kind of like clicking when in higher gears, and I have been able to pinpoint it to when a single chain link goes around the two circular things on the back wheel of the bike. How can I fix this, I've tried making it move with my hands and spraying it with some WD40 but it doesn't seem to budge.
 
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