The Oberwerk Deluxe Series binoculars and Ultra Series have 3-point floating prism plates, normally found only on the most expensive binoculars. These floating plate systems are better at maintaining alignment, but a little more difficult to adjust than the prism tilt set-screws typically found on inexpensive binoculars.
For the Ultra Series, use a flat-blade screwdriver to make the adjustment. The screws are recessed, but enclosed- so it is easy to find the screwhead.
When finished, press in the rubber plug(s), and push the rubber covering back in place over the prism cover(s). The glue used normally remains tacky for some time, and usually sticks quite well. If not, use a little rubber cement to secure the rubber cover.