How do I get rid of the new Yahoo mail and reinstall the old yahoo mail?

Depends on what your "old" mail was. You can switch back---as long as it's Classic (which is still available). BUT NOT the "All New Mail" which was the one between Classic and the new Beta version. It no longer exists. Classic will remain an option for those of us currently using it AND who don't want to (or can't) use the Beta version---even tho Yahoo has removed the link to go back to it. (they want to force you to use it) Try this bit of trickery to (quickly and permanently) get back to Classic. Just lower the page "resolution" to the point where it won't support the Beta version. Go to>>your desktop and right click on it>>click on "properties">>click the "settings" tab>>and lower the resolutions>>click OK (and/or "apply"). You "may" then be required to restart your computer. THEN-----Once you've gone back to your mail page ---you will be told that your resolution is too low and asked if you want to switch to Classic as the "default" or "permanently"---(NOT the "one time only"). AFTER changing your mail page back to Classic---- GO BACK and return the page resolution to normal, (so things will continue to work smoothly. ********************************* In Classic you will STILL get the Prompts to upgrade (for a while)---but just click "No Thanks" OR "I want to stay on Classic" (small writing bottom of page). Eventually the prompts will stop (per Yahoo)