Text coordinates overlay issues

Hello. I downloaded MCreator yesterday and I did a bunch of stuff with it.

I am making a mod that lets you see your coordinates in the bottom right corner of your screen. I added an overlay with text on the bottom right corner, but I had some problems with everything.

First of all, I was confused with the text block "replace () with () on (). I do not know what to put in the "on" slot to make it show up on my HUD. I tried a few different methods, but right now I am using something I think might not work. I have a picture of what I eventually came up with down below.

Second, the text doesn't show up in the right place on screen. 

Third, how would I set this up to actually make these changes? Do I do what I did here? or is there something different I need to do? I think the print command might not work, but I was just trying to at least get some sort of output.

My long-term goal is to make a mod that displays a bunch of information on your HUD, such as your armor, coordinates, an image that shows the quadrant you are in, Minecraft username, etc. It would not be server-side, but it would not give you an unfair advantage at all. I know I could "JuSt dOwNlOaD a MoD", but I wanted to learn how to make my own.

Images below