How to make a YouTube video on an iPhone 4?

Okay so I've got a YouTube account and I want to make a video on my iPhone. I've already got the video in my camera roll on the iPhone but I don't know how to do it can someone walk me through the process?

After you record the video press the little box with a arrow pointing out of it and you have about 3 options, one should be YouTube press that and it will walk you through the upload process

First take the video. If you want to upload it take the video go into the roll click the video and it should say upload click that then youtube

Shoot your scenes with your Apple product, transfer all you Videos to the Local Hard drive on your computer. Open you Video Editing Program, load the video(s) you shot onto the timeline. Edit, add effects, transitions, titles, credits and any thing else you want. When done, render out a file, open a browser, sign in to your YouTube account, and upload that file you just created.