To embed a video on your site you need to copy the embed code below your video, The go to your page where you want to post it. Click on the html tab. Move to where you want the video and paste in the code. Update then click on the visual tab to see what you have done.

Good Luck, let me know if you need more help.

Yes you can use it, it's just the code you use to put the video on your site.