using a small pencil tip heat the tab until a piece of thin electronic solder melts, then put the wire into the solder and hold it until it cools. The wire won't melt
The big problem is cleaning the wire. Very difficult without breaking it off. Unless it is clean it won't tin and won't make a good solder joint.
Gently squeeze the end of the wire between a folded piece of 600 grit sand paper and gently pull the wire out. After a couple of times try to tin the wire.
