Increasing Page Cache?

So I installed WordPress and then some plugins based on a friends recomendations.

2 of the plugins are conflicting (seen here)

I asked him if that happened to him and he said yes and explained the fix in this way:

“On your web host there is a setting for the amount of available memory assigned to loading pages. Under the control panel for your web host there should be a place to up your page cache. It’s different for every host and I forget the name of the file. Default is usually 8 MB, I upped mine to 16 MB and it was fine from there.”

I can’t anything like that in the site for my account.

Am I blind or just stupid?