Unreal Engine 4 (UE4) How to debug a blueprint by adding a breakpoint

To add a breakpoint, right click on a node and select add breakpoint. Some nodes will not alloy breakpoints. Functions and event can have breakpoints. When the game starts in play mode, the game will pause when the breakpoint is reached. In that blueprint, the step icon on the top can be used to step through the blueprint nodes as they are executed.