Chaya,

I reccomend a putty knife and a razor blade or "exacto" knife, a small tube of white silicone sealer/adhesive.

You need to be careful with the razor and putty knife. Don't scratch the paint on the cavity walls.

With the razor carefully trim around the edge of the ceramic tray and walls, and across the front opening where the bottom of the tray meets the base of the cavity. Use the putty knife to separate the tray from the base of the cavity.

With the silicone sealer, put a 1/4 in. bead around the base of the cavity, and across the front edge, Press the tray firmly into the sealant, clean out any residual sealer that squeezes up between the wall and tray, make sure there is no voids in the sealer and allow to dry(per the sealant reccomendations).

Thanks,

Good Luck,
:) :) :)