I have duplicated the same pages as I would normally and have logged in to the super admin. The page I have created is showing up on the list on couch but when I click on it, it comes up a red cross saying template missing on couch.

If there is a bit of code I am missing, please help! I can read it but I'm not a great coding expect.

[KK]

That message would suggest that the physical file (e.g. blog.php or blog/index.php) is not present on the disk.
Please check the template you are getting this message about and make sure it is actually available.

Where do I even look to find that?

[KK]

Assuming it was you who created the site, that would be the .html file that you changed the extension to .php and then added all <cms:editable> declarations into.

If, however, the site was created by somebody else you'll need some reading to do to catch up with how Couch works; for that please see our short tutorial (https://docs.couchcms.com/tutorials/portfolio-site.html) and it should clear up the concepts.

Hope it helps.