[Plugin: NextGEN Gallery] Gallery Problem

Hi, I am trying to figure out how to create a gallery for my portfolio. I would like the gallery to rest side by side horizontally something similar to https://justcreativedesign.com/portfolio/.

Currently, a couple pieces of my design work is on the sidebar but I want it in the middle section of my portfolio page of the site.

https://www.tosinmatti.com
Can someone help me please?
thank you!
-tmatti