Complete newbie question

I'm very new to, well, everything! I am building a website with lots of pages and was wondering if this script would be suitable for providing pagination for it? If so, where do I place all of the pieces of code? For instance, part of the instructions are 'call the function on your pagination placeholder' Where would that piece of code go?

Review the pagination instructions referenced in the issue, focusing on the example for calling the function on a pagination placeholder. Clarify where each piece of code belongs and whether the script suits a multi-page website; done means the usage steps answer these questions.

Written by the indexing model from the issue text.