I'm using the Divi Theme on my site and i want to add some code on the posts template. I know i'm supossed to modify the single.php file, but anything i do on the file doesn't work. I even tried to just the leave the file blank, then leave it almos blank except for a little "

HELLO WORLD

" or something, but nothing happens.

I tried to do the same on the twenty-nineteen file and nothing happens there either.

Am i missing some step or something?