Where do I find the "Open Octane Viewport button"

[buggy]

I just installed and activated Octane Render for 3DS Max, and I am reading the user guide, but I don't see the "Open Octane Viewport button".
I can hit the Max render button and it renders the scene in the Perspective Frame window, but I can't manipulate the scene while it is rendering.
Any assistance will be much appreciated.

[Karba]

I just installed and activated Octane Render for 3DS Max, and I am reading the user guide, but I don't see the "Open Octane Viewport button".
I can hit the Max render button and it renders the scene in the Perspective Frame window, but I can't manipulate the scene while it is rendering.
Any assistance will be much appreciated.

[buggy]

Never mind! I found it

[buggy]

Thank you Karba -- I just saw your posting.
The way it was described in the user guide was a bit confusing. It had me looking in the perspective viewport.