The bass has an output, not an input. Why are some of us touchy about that? Because understanding how things works is important, and the wrong terminology causes problems with understanding function. The signal flow OUT of the bass, down the cord to go INTO the amp's INPUT.
But if the wires on your jack are loose, they need to be resoldered, and since it's a Squier I'd suggest you spend a few dollars on a GOOD jack too. I'm assuming you don't know much about electronics (or you'd know the wires are soldered), so the smart thing would be to take it to a shop and get someone who knows how to do this stuff to replace the jack, tidy up the wiring, and make sure there aren't other problems there.
jte