Select Laser cylindrical type and Chuck mode.
Fix the ring with the chuck components, and then use a wooden block to slant the chuck by about 45°.
The ring is still focused in the same way as normal cases, with the focusing ruler contacting the inner surface of the ring.
Switch Red cross to Laser spot in Positioning mode, and then enable laser spot in the processing window. The blue light spot should be at the engraving part.
The gift is done!
Note