I have a UNO R-3 that I am trying to set up with a rear time clock shield. I have tried several sketches to up load to make the clock shield function but when I try to verify and upload them I get error messages, and don't know why and what is causing them as these are sketches I have obtained from Github or from the IDE libraries 
Usually this means that the libraries haven't been installed correctly.
You posted a message almost exactly a year ago and the advice you received then was:
Posting ALL of the code and ALL of the error messages is step 1, if you want us to help
That advice is still as good today as it was then.
Pete
P.S. I would just add that you post code or error messages in code tags (use the </> icon)