cannot add Yahoo to outlook 365

just got new desktop with outlook 365. cannot add yahoo account. i believe problem is i need to add 2-step verification to my Yahoo account, however when i go to Account Security all is am shown is "this is how you sign in" which allows me to change password but rest of screen is blank (unlike all the image when i google how to do this). I have cleared cache, tried different browsers (chrome and edge) and tried different computers (3). can any one help?