Since we don't have your code, it's difficult to help with your situation. This is one example of how things may be written.
# Our player scene which has a script attached to it. The script takes the base properties of the player scene and does something more with it, i.e. they "extend" the node. Our variable, "some_variable", has a value we've made. This property can be accessed through the "." operator. The value of the property can then be set (that is assigned) to the "text" property in the Label.
some_label.text = the_player.some_variable