Why won't the plugins icon show up? (UE4.10.1)

I am trying to build for the Gear VR (slightly irrelevant), and when I follow the instructions here it says to go to Window > Plugins, but the Plugins icon isn’t there. I compared my screen to their screenshot and I don’t have the plugins icon.

That page needs to be updated apparently. It’s under Edit > Plugins.

Thank you!