It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

I saw something on line about how to add saves and I had no clue there was a limit to begin with. Is this true, or is the guy who wrote that thing I read delusional?

This question applies to both #1 and #2.
This question / problem has been solved by The-Businessimage
In HD1, there is one save slot per mission, but as far as I remember, you can save an infinite amount of times. Maybe this is about keeping several saves per mission?