Mcdevito75 here, First look for any for any notches or cut outs on the cover, there should be a cut out on the cover for the stem, at this point line up the cut out with the stem, place the watch on a sturdy surface, Table, counter top, make sure the watch is completely flat on this surface with the cystal (glass) faceing up, now place the palm of you hand on the crystal and with even pressure press down slowly and evenly, the back should snap on.
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Mcdevito75 here, First look for any for any notches or cut outs on the cover, there should be a cut out on the cover for the stem, at this point line up the cut out with the stem, place the watch on a sturdy surface, Table, counter top, make sure the watch is completely flat on this surface with the cystal (glass) faceing up, now place the palm of you hand on the crystal and with even pressure press down slowly and evenly, the back should snap on.