Subtitle colour dependability

What steps do I need to take to ensure my subtitles render in yellow every time I watch a movie? I have done everything I can think of and everything I can find recommended online and now I think I’m worse off than when I started.

Can someone please clearly explain or walk me through just what I have to do to make this a consistent and reliable feature? I beg of you. I know we all have our idiosyncrasies, and mine is yellow subtitles. It’s starting to bum me out. So…what filetype, what settings where, all of it. Just tell me what to do I know it’s built in there.

If someone, anyone, wouldn’t mind just jumping in here for 30 seconds to leave me a message telling me that “it won’t work”, or “it’s a problem but low priority”, or anything to just help me stop looking for fixes if there really isn’t one. I’m not the most technical but I can figure stuff out if I have to - if it HAS to be external .srts in the same folder, or if they have to be muxed in, or if they have to be adjusted in a third party software or WHATEVER, I would truly appreciate it.

Help out your fellow man.