In order to install the Wake Sketch Plugin you must first install the Wake OSX Uploader.
Once Wake is installed, go to preferences and click the 'Install Sketch Plugin'. The plugin will automatically install itself and you will then be able to upload artboards from Sketch directly to Wake.
Select one or more artboards and then press ⌘ + Shift + W.
You can also change your keyboard shortcut within Sketch by managing your plugins