As Joe stated, you need to upload to a video host such as YouTube or Vimeo then in a post here give the web link to it. Without editing its a fairly simple process, but where only done by me every couple years, one I have to repeatedly relearn. If doing editing before uploading to a video host the process can become very complicated & time consuming depending on how professional you want the presented video to be. I have several links to videos here & even though they are far from professional quality they still took considerable time for down load from camera to computer to link established for view here by the C-Brats.
If you now have a video on your computer ready for viewing go to either Vimeo or YouTube & fellow their directions for uploading a video to them. Once the video is hosted by them providing a link to it is the same as posting a link to any other web address you want to share.
Jay