Hi Darryl,
welcome to the German Shelly Forum 😉.
The physical wiring you can find here

The i4 is the remote (http Webhooks) for the Shelly 2 or 2PM only.
1. connect your blinds with the 2PM and calibrate the end-positions
2. install the i4 with pushbuttons and configure your Webhooks. A lot of examples you can find here
HTTP-Request Shelly PLUS 2PM