NOTE: These directions may not be exact, but they will get you on the right track.
To get up to Melgorhen's Reach…
arrange runes (when e is under z, push z; when e is under r, push s; when e is under o, push r; when e is under s, push o. Just keep doing this pattern until you see that all the stairs are in place.)
wait for cab to arrive
wait till cab comes to a halt
lay on the altar
to get out of the water slide, lean left on the first, third, fifth and seventh turns.