Baby should be close enough to kiss in the ring sling.
If you baby seems to fall lower on your body, then the ring sling may not be tight enough to start.
Make sure the shoulder of the sling is cupping your shoulder and that the sling is spread widely across your back.
To tighten more easily, try tightening from under your arm and across baby's back by bringing the slack in the sling to the rings before pulling it through, and always maintain a secure M-position for baby, who will be seated in the hammock of the carrier.
We recommend starting with your sling pre-adjusted so you don't have to make a lot of adjustments once the baby is in the sling.