HOW DO YOU SEND SOMEONE A MESSAGE ON TWITTER ?

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NOW I NEED TO KNOW HOW TO SEND A FRIEND REQUEST TO SOMEBODY?

[paperclipofdoom]

If you mean a direct message, go to your Twitter home page. Click direct messages on the right sidebar. Choose who you want to send it to, etc.

OR if you just mean a response, like the @username thing, then you go to a page where their tweet is. This could be your homepage if you're following them, or it could be their actual page. Hover over the specific tweet - you should see two symbols appear on the right side - and click the arrow. Type your reply and send.