Adding Item information for Armor on MCreator 2020.2

override the addInformation method in your item's class

after you created the armor element, save it and go to the main window where all your mod elements are displayed.

on the left of the window click the button "Edit code of selected mod element".

you will see in the code lines like this: 

    elements.items.add(() -> new ItemArmor(enuma, 0, EntityEquipmentSlot.HEAD) { .... }

there's code blocks like this for each of your armor pieces. in the one you want to add text info, add this method:

@Override
public void addInformation(ItemStack stack, World worldIn, List<String> tooltip, ITooltipFlag flagIn) {
    super.addInformation(stack, worldIn, tooltip, flagIn);
    tooltip.add("Info text 1: blah");
    tooltip.add("Info text 2: blah blah");
}