After watching the video, you can take a look at this profile that correctly uses the <span> tags (and yes, you do fill in your own tag names). I recommend using the author's surname for your tag name. For census records I copied someone else's idea and use 'Census1850'.
I suggested this record because it also references a source that has been saved in the source category. There are a number of sources included in the category and they each have a page with an example of the reference, the citation, and places where you can find the source online, mostly for free.
Don't worry, once you start using the <span> tags, they become second nature.