If this is during the wizzard when creating a process, my question is do you own "Process Management" or just other LiveCycle products?
I dont own the process management module, i have extended reader and signature blocks, thats it.
I would guess that is why it is grayed out then since you don't own it.
You probably can still create short lived processes that can be accessed via REST. If a process is initiated through it's REST URL in a browser and returns a Dcoument, that Document will render in the browser. So you can create a Reader Extended PDF that will open in the browser. Submit can also launch another short lived process passing the submitted data or call the same process if you have an optional input variable and a conditional route based on it being submitted. I will admit it probably sounds daunting not having done the stuff requiring Process Management.