Go to www.youtube.com
Click on "Upload".........(you may need to create an account before you can upload to youtube)
Then click on "Select files from computer"
Browse to location to select video and then select "Open"
Once you click on "Open" the upload will start processing, takes a while to upload......however during the upload you can give the video a title........description etc
Once the video is uploaded successfully, click on the video link.
The page the video is on will load, here you need t click in the address bar to highlight the entire address, right click or ctrl+c to copy the page address
Then go to your post on Koionline and click on the "Video" icon and right click paste or ctrl+v to paste the link to the youtube video
Then voila, your video link will automatically link into your post