Help for changing bit rate with Audacity

I downloaded Audacity hoping that it will help me change the bit rate of my mp3 file.
If I have to guess the reason I am not successful to do that, I would say that for some reason I dont have the ‘export’ option I only have ‘export audio’, ‘export selected audio’ etc. Apparently, according to you-tube videos, I should have a option that says just ‘export’, but I dont.
I already wasted a few hours on this and the farthest I went was to change the bit rate but only by changing the file into a mp2 file, which I cant use for what I need it now.
I would greatly appreciate if someone can help me with this issue asap. TIA

Which version of Audacity are you using? (look in “Help > About Audacity”). If it’s not Audacity 2.1.2 you can get the current version here:
To export as MP3 you need to install LAME. See:
To set the Export options see: