How do you answer to celebrities questions on twitter?

[cathugger]

If you see a Twitter from someone and you want to reply to it, hover your mouse to the right of the message and you will see two symbols. One is a curved arrow - click that. That will preload your typing box with an "@" and the person's Twitter ID. Then leaving a space after their ID type your short message and press update or reply under your typing box.

It will look something like:

@JoeSmith My answer is red!

(you can also type the @ and their ID by hand)