When in doubt, decompose (break into smaller parts) the problem!
You need to display a GUI. You need to accept input from two widgets and convert it integers. You need to add a range of numbers. You need to concatenate a string of what you're doing with the addition. You need to display an answer in a widget and maybe redraw the window.
I've been having success copying the assignment into my source file and decomposing it as comments to frame out my program.
If you select the picture you can go right to the tools for the picture. You can use a picture editor or just the main picture tools depending on what type of computer you use.