So what it seems like what’s going on is that you’re trying to call the function, but you cannot find it. Correct?
Think of the functions kind of like telephones. Making a custom function (red box, only has connector on the right, none on the left) is like establishing a new number. These events can only be “firsts” and usually have something to call them, whether you do it manually (like with custom events) or whether it’s done automatically (like Construction, and BeginPlay). But - - if I’m understanding correctly, you want to call the function? Right click on an empty space and type in the name. That will make a blue (or green) box to call the functions (green tend to be pure and have no execution input/output). Blue/green functions are the ones making the “calls” to the ones that have a start, and can never be the start of a function, they can only be the middle/end.
Have you tried changing the “Number” in the “SpawnNormalMacro” from the video from 2 to 3? I haven’t taken a look at that project, so I’m unaware if that “Number” input for the macro is the number to spawn.