"Target" when calling a variable from another Blueprint

I have this Float variable from my Character Blueprint (MaxHealth) and I want to cast it to a Text Variable in a Widget Blueprint, so that the value appears as a text inside the widget.
I create a new function binded to the Text Content, and from there I put a “Get Max Health”, problem is that by default it has a character “Self”, which isn’t enough, but I don’t know to which target should I wire the variable.

In side your widget you can [Cast to:your character] and connect up a [get character] to it, as [Cast to:Your Character] drag off the [variable] you wish to target and update it to the return node, make sure the return node in this widget function is a text variable.

The tutorials that this site have to offer can cover a lot of basic problems and issues, as I have recently learn and took in.