You can talk to other users and objects using the keyboard, you can move around a collaboratively defined virtual space, and you can use other objects. If you look at the screen descriptions carefully, you will see references to exits available to you. The MOO is a collection of programmed objects. Every programmed object has certain verbs that accompany the object. As a player object, you can speak and move around.
All objects have a name and an object number.
When having trouble, try using the object number instead of the name. The Infocenter is a series of gopher shelves and other objects. Feel free to explore. The emote programming knows to substitute your name in the front of the sentence. Try smiling at someone else.