For manual timestamping, Using this post link as an example - https://m.youtube.com/watch?feature=youtu.be&t=219&v=NUWdNaBNk8A The "&t=219" means start time is 219 seconds into the video. Other YT videos may have "?t=219" appended in the end of the link. I am not sure of the syntax rules at YT, so I always test the my modified link to verify it works before posting. Otherwise, click "share" on your YT screen while watching or pausing your YT video, select the option if available to copy video address or copy at current location. If all else fails, do a right mouse click on the video itself, a pop down menu of similar options should offer you to copy video address, copy video address at current location, and other options. Some YT videos disallow the drop down menu, again I'm not familiar enough to understand why - probably an option enabled by the creator of the video during upload.