Mastering the Squared Circle: The Ultimate Guide to WWE 2K17 PC Controls (Keyboard & Mouse)
From here, you can remap keys to a layout that feels more natural, such using the for movement and the Numpad for actions.
To perform a move, you do not simply press 'K'. You must initiate a grapple.
The default setup is borderline unplayable for competitive matches. You must remap your keys.
Alternatively, you can use the to initiate specific grapples without the lock-up animation, depending on your settings.