1) On mobile, for this page, https://www.junbugg.net/junbugg-fitness-wealth, I've tried numerous times to insert the YouTube video link but I can't get it to correctly format. I placed my cursor right after the first paragraph but the letter "A" from the second paragraph stays in from of the video. How do I fix this?
See link - http://prntscr.com/s75m7u

2) How do I upload a video and insert it into a web page. It's a windows MP4 file, 39 meg, and 1 minute in length. I want to size it 300 X 169.

Also, is there a way that I chose the image that shows for the video?

3) I just purchased the jce editor update and received the license key in my email. Where do I put the license key at?

1) How exactly do I add paragraphs? I pressed enter 3 times and none of the boxes showed that appear on your video! Don't see an icon for it on my menu bar, nor all the other icons you have. How do I add icons for these features? http://prntscr.com/sdrivh
My tool bar doesn't look like yours - http://prntscr.com/sdrr2d

2) Second question. I didn't explain myself well. I mean, with in the video, how do I select what part of the video will be the preview image of the actual video? I want to choose a part of the video that is nice, clear, and colorful.

1) I did exactly as you said. How do I remove this space it keep adding here? http://prntscr.com/sgg8ao

Also, on mobile, part of the video is showing off the screen. How do I fix this?
I tried making the video size 300 X 169 but it adds a lot of space underneath the image. How do I fix this?

Also, there's still a lot of space showing on desktop view. This doesn't look professional. How do I fix this?
http://prntscr.com/shxfev