Update: Bloomberg has created a new training program to prepare users for its certificate.It's called Bloomberg Market Concepts. Please be aware that students will need to finish ALL four sections to for the certificate.
To access Market Concepts program, you will need to login to Bloomberg Terminal and key BMC <GO>. Here is a link to logging in instruction: http://faculty.cbpa.drake.edu/suh/BMC-login-instructions.pdf.
With your Bloomberg login information, you get access to the Bloomberg Essentials program. This programs allow you to receive training on specific aspects of the Bloomberg system followed by a test to demonstrate your knowledge of the system. Access these training programs using the BESS function on the Bloomberg Terminals.
For more information, you can read Bloomberg Help Page.
A number of other libraries and universities have developed resource guides for Bloomberg. If you're looking for information and away from the help at the Bloomberg terminal, these are good places to check.