If you meant the other teleporter pad, then you are pretty much at the exit. You can just keep going west on the first level to get there, and do not have to click on the pyramids to activate the teleporter pads (though you will miss some experience and loot if you don't). The lower levels of the dungeon are optional.
As for dropping teleporter stones, you need to stand fairly close to them (so they are highlighted white when you move the cursor over them), then click and drag them into your inventory (or onto the menu bar) to pick them up again.
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