To upload a video to YouTube, go to youtube.com and sign in with a Google account if available or click upload to select a video file from your device. The video will upload and process before it can be published and shared on YouTube by clicking buttons to publish, share the link, or embed the video on other sites. Bloggers can also share YouTube videos on WordPress by logging into their account, copying the video link from YouTube, and pasting it into a new or existing blog post on WordPress.