OBS Setup

Hit the Plus sign to add a new scene.

Choose the window you want to record and then OK.

Scale and position to fit the record window,

Go to Settings . . .

Set Hotkeys 

Start Recording: <ctrl> + <up>

Choose Output and Browse . . .

Browse to the Documents > OBS  and select folder.

Here is my path example:

C:/Users/Cornell/OneDrive - Cherry Creek School District/Documents/OBS