The first thing to remember is that "consumer" in this context means the people who social workers used to call "clients" and not "consumer" in the sense it is usually meant. What your teacher wants you to demonstrate is that you understand the evolutionary process within the field of social work reflected by that change in nomenclature, from "clients" who are the passive recipients of services provided by an agency to "consumers" who are the agents making the decisions about what services they will access and how. Your teacher wants you to do that by choosing a social work process such as assessment or intervention and describing how that process goes within a consumer empowerment model as opposed to the older way of doing things.
So, your first task is to review the relevant readings and make sure you understand them. Next, choose which social work process you would like to use as your illustrative example. When you write your essay, you'll want to define and explain the consumer empowerment approach in the introductory paragraphs and then use the social work process you selected to illustrate what you say. In conclusion you may wish, in addition to summing up, to offer your own assessment of the consumer empowerment model.