Final answer:
End users access the service catalog through the Service Portal by navigating to it via a web browser, logging in, browsing through categories or searching for services, and then selecting and requesting the desired service.
Step-by-step explanation:
When using the Service Portal, end users typically access the service catalog by navigating to the dedicated portal page via a web browser. After logging in with their credentials, they are often presented with a catalog of services that an organization provides. Here, users can browse through different categories, search for specific items or services, and view detailed descriptions of each offering. Once they have found the service they require, they can select it and, if necessary, fill out an order form to request the service.