Hello .. the two timer terminals are for power to the internal timer , The other terminals are for the switching of the light
That depends on the terminal connector .. if there is a place for two wires then use a jumper .. or strip the black wire near the end , and attach to the common .. and the strip a space to attach it to the timer terminal ..
Jumper is just a term for a short piece of wire that connects two terminals on a piece of equipment .. Sorry
So just use a short wire to connect the two terminals ..