I need heat in more than just one part of the house

The only place that the heating plan is working at our home right now is in the master lavatory, however i don’t entirely understand what the problem is with the heating plan in the rest of the house, though.

I don’t recognize anything about furnaces at all, so there’s no way that I can figure it out on my own. I recognize how to swap out the air filters and I recognize how to set my control machine unit, however that’s basically the gist of my heating, ventilation, and A/C knowledge, but the whole home is frosty except for the master lavatory, for some reason. The rest of the home won’t get moderate and all of the heat seems to be staying inside of the master lavatory. It wouldn’t be so bad if I wasn’t working from home right now! Since I have to do a lot of video calls, that means that I have to set up my laptop and all of my machines in the lavatory since that’s the only moderate place in the entire house. It’s entirely bad to have to do tasks from the lavatory all the time, though. I wish that the heating plan was now working respectfully in the rest of the house, however I don’t know what to do about it. I am going to have to call the local heating, ventilation, and A/C supplier to make an appointment with them to see what the problem is, though. There’s absolutely something wrong, however maybe it’s something to do with the air duct. I hope it isn’t the oil furnace itself that’s torn up because I don’t have a lot of money to spend on an oil furnace repair.

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