Apple iMac G3 (Original) - Manual (Page 12)

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2 To install a DRAM DIMM, align it in the DRAM slot as shown below and push the DIMM down
until it snaps into place.
Important Do not touch the DIMM’s edge connectors. Handle the DIMM only by the other
edges.
The SO-DIMM is designed to fit into the slot only
one way. Align the notch in the DIMM with the
small rib in the slot and insert the DIMM at an
angle, as shown. Snap the DIMM into place by
pushing down on it until it is lying flat and
parallel to the main logic board. Your DIMM’s
shape and components may look different.
To remove the SO-DIMM, spread the two
arms of the memory slot apart slightly.
The DIMM will pop up.