I figured out why the Gridmarket wasn't looking right

I think I figured out why the "Gridmarket" theme wasn't looking right to me.

I watched a long video on Marketpress and I found out in my "Network Admin" that I don't have the Marketpress or multisite installed. However it offers no where to upload them in my Admin panel.

Would there be a reason for this. It only shows a few of my active plugins.

Brenda