[otrs] Introduction

First of all I wanna introduce myself, I´m from Uruguay and have been investigatiing the OTRS software for a couple of weeks now. I have it operating on SuSE 9.1 and it´s working, what I´m trying to do now is to figure out the hole system before we put it to use on our company, since I´m going to be the administrator. The first question that pops to my head and haven´t found and answer yet is, Where does one go to delete, users, customers, etc? Does one had to go into the mysql database to do this?, since I´m doing a lot of testing and starting to need to erase the things I do in order to start over again. Well, I´m going to try to found some answers on the documentation. Best Regards..