Put color bars in your sequence and park the cursor over them. I think they’re under the “file” menu. Paste this in your web browser and off you go…
https://www.videouniversity.com/tvbars2.htm
Concentrate on the TV since that’s where your stuff is bound for anyway. Plus, it’s a better picture than the monitor. Once you get the TV set up, leave it alone and just check it once in a while. For the computer monitor the best thing is just to do an eyeball comparison to the TV and use the monitor’s panel controls for adjustment. You can also use your graphics card control panel to tweak the monitor. This is down and dirty but without scopes it’s your best bet. You have to trust your setup, though. If it looks dark in the TV, don’t adjust the TV!
It would really help you to familiarize yourself with PP’s built-in scopes — they’re good. While your cursor is parked over the bars you could check out how they look in your PP program monitor with different scopes. Choose them with the pull-down menu at the top of the monitor. Do a help search for items such as: waveform monitor, vectorscope, color bars, black level, setup. There’s lots of web info, too, and some very thick textbooks on SMPTE color bars and calibration theory. If none of this helps and your footage is green on your aunt’s television, tell her to buy a new TV.