First Person Template Unable to Add Health Variable

So I’m working off of the First Person Template and tried to add a “Health” variable to the “FirstPersonCharacter” they give you but every time I click it just comes up with a blank bar on the right. As if the editable region is greyed out. It also doesn’t come up with a new variable, so it isn’t creating one at all. I know the FirstPersonCharacter is coded with C++ but is there a way I can add a variable that’s easily editable in Blueprints?