You can edit the sketch to make it cycle automatically by default. Find "boolean autoCycle = false;" and change that false to true and the images will cycle every 15 seconds. The following line says, "#define CYCLE_TIME 15" -- that's where you can change the cycle time.
You'll find the line that says, #include "graphics.h" When you've created more images files, that's how you select what set of images will load into the poi.
Click the check button to verify/compile. If you get any error messages, check to make sure you installed everything correctly.
Plug the microusb cable into the poi. You should hear Windows detect the usb device; one second after that chime, click on the app to upload the code and watch the progress. When the app says the upload is complete, you can unplug the poi and you're good to go. If you get a communication error, you probably tried to upload the code too soon or too late.