A wizard eh? Not the easiest guild to start in, to be sure. Anyways, the Unseen Uni is in Ankh-Morpork. Starting in the Drum, if the Urchin is there say "Take me to the Wizard's Guild please". If that doesn't work say "Help Urchin"
If there is no urchin wander out of the Drum, then in an easterly direction 'til you find the Plaza of Broken Moons, then North to Sator Square, UU being off the Northeast of that.
Be sure to get the map of AM of Airk's site (see the player links off the Disc site)
Oh, and look at 'help colour' (or maybe color).
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Discworld MUD