walk someone through something Meaning   to explain how to | English Choice

walk someone through something

Meaning
  to explain how to do something in detail

to guide someone carefully or step-by-step about how to do something

For example

 I wish you would've walked Samantha through the budget process. Now we need to go back and fix some of the coding.

I've walked Karen through QuickBooks at least seven times in the past two weeks and she's not grasping anything.