This garbage of a program must be the least documented trash ever produced. The help option is basically useless in it. I tried to google how to make a new project. Literally 0 information about that. I can only open the welcome hello world program and code. Nothing else. I can't save the changes in the starting hello world program because of missing cart name. 

I tried to create a new "cart". I wrote: new lua test1". It said it was successfully created. I tried to open it with "load test1". I t said there's no such file. Wtf.

I spent  $10 on  a garbage that is literally unusable.

Here is the documentation : https://github.com/nesbox/TIC-80/wiki

Github does not allow the wikis to be referenced by google but it is linked from the Learn page of the tic80.com website, etc

And you need to save your cart before loading it.

when you open it up, and it has the type help window (the terminal), type

new lua

(Enter)

save test

(Enter)

load test

(Enter)

edit

(Enter)

do your thing, (escape key), back in the terminal

save

run

(Escape key)

Close game

load test

should work…