I need to somehow identify duplicates of a single word within a phrase, within an Excel cell, throughout the entire sheet. Identical to the thread at this link: How to identify duplicates within text in two columns in Excel
However, I tried to follow the instructions by commenter Rosenfeld, and got to the step to insert a module. I copied and pasted the code he said to, but from there, I don't know what to do. There is no option to "save" or "enter" the module, and it is not automatically applying. Unfortunately, I just stumbled upon this post and this website, so I do not have sufficient reputation to comment on the above thread, and have to create my own question.
I should note that i do not need to remove duplicate words. If anything, I would like to highlight or bold them, but will settle for some other indicator pointing out which cells contain duplicates, and I can figure it out manually from there. Also, I have Excel 2016, on a PC.
Thank you!