I have massive amounts of email in my inbox folder for Yahoo. How can I delete them all quickly?

I have about 20,000 emails in my inbox. Most are at least a couple years old. Its bothering me, and I don't have the time to sit here and delete them all by hand. Is there some button or something that I am missing? Or am I just going to have to sit here and delete them 20 at a time? Thanks everyone!|||easy,make a new email,send a message to all ur contacts tellin them u made a new account,and then just ignore ur old one|||Hit the Other Options button, hit Select All, then go to the left and hit the Delete button.|||Place a check mark in each box and click on delete|||click delete all|||just hit select all