Hey PaQ,
Here's how you find the app and enable it in OnShape:



So, download and install from cyborg3d, then before you launch, enable in onshape. Then when you launch npower software, it prompts you to log into onshape account. (I show the menu to import and export everything from onshape, but this is the part waiting to be fixed right now.

My onshape app says "Connected to desktop app". A new install will have an "allow" button.