I need to lock my code

I'm trying to make a mod, I've tried to add code to import my mod items, but it doesn't work nor save, even when I use Ctrl s.

So I need to lock my code so it saves, and hopefully works. Unless I need a lot more different line of code to import items than copy pasting the import blocks code but changing blocks to items.

Please tell me what the line of code is to lock code, and wether or not the line of code needed to import items is different from the line of code needed to import blocks, and if it is, what the line of code looks like.

PS I have looked at the page of locking code, it did not help.