I was wondering if anyone could explain to me how to represent a loop from UML sequence diagram in a Class Diagram.
Here’s the Sequence Diagram:

and here’s the Class Diagram I made from the Sequence Diagram

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You don’t.
Class diagrams are not about code execution; they are about the structure of your classes. In other words, your sequence diagram has a time component that shows the reader what happens during the execution. Class diagrams, on the other hand, are supposed to show class relationships (i.e. which class is associated/uses/derives from another class).