How do you reply to an answer on yahoo anwsers someones?

No I have no idea how to!

Using your mouse, you click on the button called "Answer" located just beneath the question. It will bring you to another page listing the question and a box below it called "Your Answer". Click inside the "Your Answer" box and type your desired answer using your keyboard. Once you are done typing your question, you have the option to list your source. Click inside the box as before and type in your source of information. Once finished, scroll down the page and you will see a "Submit" button. Click the submit button and..... Voila! Hope this was helpful. Good luck.