To make a delegate, we're going to write the following above the line that begins with public partial class...:
public delegate void LabelUpdater();
This is a delegate. It's public, meaning that it is accessible from anywhere. Notice that it's a keyword--it's blue (Windows) or teal (Mac). Then, void is a return type and LabelUpdater is what we named it. This line will basically be used to represent several different functions. So, in our case now, specifically under the Button1_Click event, we're going to write some code.
As our first step, go outside the set of curly braces under the line that begins with protected void Button1_Click... and enter the following under closed curly braces:
public void UpdateLabelOne()
You say void because the methods that are called through the delegates have to have that same void return type as we have...