Replace the capacitor by soldering a new capacitor of the same type on the exact same spot:

scratch the green plastic of the printboard (with flathead screwdriver) to improve conductivity and cohesion;

keep the capacitor on the right spot, hold the tin against the pegs of the capacitor and heat the tin with the soldering iron. The tin will cool down and the capacitor will be fixed.

Caution; the soldering iron will be hot. Do not breath the soldering fumes. They are toxic. Perform this action in a well-ventilated area.