This ad on a YTMP3 converter makes it seem as if it's the button you are supposed to click to convert (sorry for bad quality. I'm working on a school project) :
GitHub - pranavrao145/yt-mp3-converter: Application to make converting youtube to mp3 easier.
Best Way To Convert YouTube Videos To Mp3 Files with YTMp3 Download
Any good YTMP3 Alternatives? : r/FL_Studio
YTMP3: Best Ways Convert YouTube Videos to Mp3 for FREE - Latest Gadgets