How to pull data directly from FRED at Federal Reserve?

I have asked this question previously but I could not make the suggested options work for me. I am looking for an intermediate Excel option, rather direct pulling data through Json feed. May I request a worked-out example for this particular chart? - 10-Year Treasury Constant Maturity Minus 3-Month Treasury Constant Maturity (T10Y3M) | FRED | St. Louis Fed

Ref: St. Louis Fed Web Services: FRED® API