I believe I did what this site (https://beckabney.com/mk64/bestpace.html) told me to do correctly, and it did not work. Anyone know of a solution or if there is a different way to add this?

Not sure what you are trying to achieve exactly.
You want to a have a sum on Livesplit layout, that shows how much you are faring against your best pace on the splits you did in the run so far?

~~I don't know this "information/delta" addition to the layout, never used it.~~
"Information/delta" should be in the layout resources when you download Livesplit, so I'm not sure what the download there even do.
Anyway, what you tried to do, and what step is not working?

(This post should probably be in the Streaming / Recording / Equipment forum)

I fixed the issue. It turns out I did follow the directions correctly, but when I open LiveSplit it asks if you want to update the delta component. If you press yes then it ruins it, but if you press no, then it works.