in the App, press the (+) button -> "Add a product" -> "Remotes" -> scroll down to "For blinds" -> "Blind remote" and connect the remote with the Dirigera hub.
If not yet done, then pair your blind with the Dirigera via the app again.
After that, go to the Products screen of the app, open the blind device, press the edit button on the top right corner -> "Connected remotes" and assign your remote there.
Now you can steer the blind with both, the app AND your remote button.
Hope, that helps!