How to start fires around a fluid

Hey all!

So I'm relatively new around here, still getting used to MCreator, and I'm using it to fill in holes of a modpack I'm making for private use amongst some friends.

However, One of the things I'm making is an extremely hot fluid (Hotter than that of Blazing Pyrotheum) and it seems Ill fitting not to have it start random fires nearby like Blazing Pyrotheum does. I've attempted to do this under the UpdateTick function for the fluid, but when I try to use the block code (Which is a system I am NOT familiar with) any attempts I make result in "You have selected an external trigger that does not provide the following dependancies: x y z"

So how would I chunk out this block code to randomly generate fires around the fluid for about a 3 block radius. 

I am using 2020.2, for 1.12.2 support.

Also if anyone knows how to spaces between the names of items please let me know, every time I try it either disallows it or if I use an underscore it just merges it together and its a little irritating to see "MoltenFluidname" in game