Help with keeping image up for a certain amount of seconds

I am working on a Simon clone for the Arduboy and this is my first game with using the dpad instead of colors. I have a big glaring issue which is I want to set it to where the arrows will pop up for a certain amount of time and 1 at a time. I use a loop but the code is registering all of them to pop up at once and along with they go away too fast.

Can you post your code up?