Adding Plugin to pages.

I just getting started with 2017. One question is how many pages am I allowed? It doesn’t seem to want to allow me to add more than five.
This is what my site looks like so far https://www.appleledgephotography.com What I would like to do is takes the square images located here https://appleledgephotography.smugmug.com/ and imbed them on my portfolio page with a link back to the Smugmug pages.

Hopefully someone can help.

Thank you