can u help? can u post the code ?
Sure. You may be able to use a transistor, but if you just need to connect two wires together, that's a more complicated way to go.
FWIW, your "project" sounds very suspicious.
To me it sounds like he's hacking a remote control, which has been asked a million times here.
He is however, as is so common, failing the comprehension test...
You cannot use the arduino to connect wires together. It is not a switch