In one sentence, describe what the following article is about:

Tap the YouTube app icon, which resembles the YouTube logo. This will open your YouTube home page if you're logged in.  If you aren't logged into YouTube, you'll need to select your account or enter your email address and password when prompted before proceeding. If you plan on extensively editing your video before uploading it, you may first want to transfer it to your computer and edit it there. If so, consider uploading from desktop instead. It's in the upper-right side of the screen. Doing so will take you to the upload page. You may have to allow YouTube access to your phone's camera, microphone, and/or camera roll before proceeding. Tap the video that you want to upload. You can edit your video's length by tapping and dragging one of the ends of the video bar left or right, or you can change the video's visual presentation or music by changing to the proper tab at the bottom of the screen. It's in the top-right corner of the screen. Type a title for your video into the "Title" box, then type a description (optional) into the text box below the title. It's in the top-right corner of the screen. Your video will begin to upload to YouTube. Once the video is live, you'll be able to view it on your channel.

Summary:
Open YouTube. Tap the "Upload"  icon. Select your video. Edit your video if necessary. Tap NEXT. Add a video title and description. Tap UPLOAD. Wait for the video to finish uploading to YouTube.