You can insert breakpoints by double clicking in the column to the left of the line numbers in the source code or you can right click and select “Toggle Breakpoint”. The breakpoint symbol appears to the left of the line number as shown here.
Click the “Resume” (shown in the figure below) until the program continues running and the resume button stays grey.
Once a thread suspends due to a breakpoint you will see that line of code highlighted in green as shown in figure 1 and you will see that the thread is suspended due to the breakpoint in the debug window as shown below.
You can enter multiple breakpoints and debug the application.