Ensure the device is fully deflated via the stem valve, then flatten or roll the silicone ring to achieve the smallest possible entry profile. Apply a water-based lubricant to the leading edge and guide the deflated device smoothly past the introitus along the posterior vaginal wall into the upper third of the vaginal canal. Once positioned at the apex, attach the inflation bulb to the stem valve and inflate the donut with air to the clinically prescribed volume to provide customized, pressurized structural support against apical descent, then securely close the valve mechanism and tuck the inflation stem entirely within the canal.