That's true enough. Now, I brought some tools and a new set of strings, so at least you should be able to play that way. When you're replacing your strings, you should do them all at once, though I guess in this case there's no real option not to. Here.

[She retrieves and lays out six strings on the table.]

The knobs the strings are attached to at the top are called machine heads, and the fasteners down on the body are bridge pins. Can you loosen the ones your string is on so it pops out?