Help with some HTML coding through this website?

[piquet]

generally, websites no longer use the html itself to set things like font colours and the like, this has been surpassed by "css" which is a way of assigning attributes to html tags.

using the older "html only" way is rather clunky and outdated but would work like this:
| <font face="Arial" size="3" color="red">The text between this HTML font tag is displayed using the Arial font, the size is 3, and it's red!</font>

as per the page you linked to, you need that vertical line character in front of the html (see above) - this is unusual but is probably why html you've found online doesn't work.

a note on using "font face" to change the font - this only works if the visitors to your site have the font that you've specified installed on their system, if they don't it'll default to a standard plain font.