Final answer:
A System Administrator can edit a catalog item by clicking the "Edit page" button in their user bar, modifying the suggested structure, and then saving the changes.
Step-by-step explanation:
To edit a catalog item, a System Administrator would need to navigate to the specific item within their system's catalog interface. Once there, they should look for an option such as "Edit page". Generally, this can be found in the user bar, which is often at the top or side of the screen, depending on the system's design. After clicking "Edit page", the administrator will be presented with a suggested structure for the content that can be modified. Editing may involve making textual changes, updating settings, or other adjustments as required. Once the changes are complete, it is essential to hit 'Save' to ensure that the adjustments are applied.