Display instructions on button click with respective to sequence steps

Hi, 

Currently I working on AR project for step-by-step assembly process and we actually not familiar with Vuforia. 

Need advise for my problem regarding my concern on 'Play' button that I have created. I need Vuforia to display the sequence instruction when user click on 'Next' button. For now, the first step instruction display throughout the whole process, but I actually want one step with one instruction process. 

Hope anyone can advise me on this matter. Really appreciate it!