MyQ Garage Door If This Then That- for dummies

I am new to the home automation world and I know nothing about code! I would like to set the MyQ (Chamberlain) Smart Garage Door to close after being open for longer than 10 minutes.

Everything I have read has been confusing and is written for folks that already know what they are doing!

I have an iPhone and have the smartthings app- the MyQ app allows a schedule that I can set to close my door at a certain time if still open at a certain time.

I need a basic step-by-step guide on any apps I need to add and how to do this and act like I am at a 5th grade level when helping me!! LOL

Thanks in advance to anyone that can give me guidance.