Can you help me with an urgent plumbing issue?

I started my washing machine and the hot water hose popped off!

Water was pouring out all over the basement floor. In my panic, I managed to yank the plug out of the wall and think clearly enough to run to the crawlspace and shut off the main water valve.

Now, of course, I have no water anywhere in the house and I can’t find a shutoff valve for just that appliance.

The problem area is in this picture. I can’t just reattach the hose. It looks like a solder broke on the copper.

There is a toggle (highlighted) between the 2 inlets but it won’t budge.

It’s in the basement. There’s a bathroom on the other side of the wall and another bathroom above it. The water heater and main valve are on the same level.

Do you have any idea where I should look for a shut off for the washer? I can’t afford to call a plumber and my dad can’t get here for another 5 hours.

Should I try to loosen that toggle with WD40 and a rubber mallet? Or does that have anything to do with water flow to the machine?