Ok...this description makes more sense than the one over on SOE's forums...
In game type /loadskin poweroftwo and that should load it.
You can also edit your eqclient.ini (use TextEdit)
Change Default to poweroftwo and save it. Then, launch the game and move things around.
The Options menu isn't listing any custom UI's you may have installed. It's still a beta, remember

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Wulfgar - Lvl 52 Barbarian Warrior, LFG in PoFire!
chown -R us ./base