Answer
Open your Zoom activity in TUWEL and select the "Previous Meetings" tab. There you will see an overview of your past Zoom meetings. Note that you can only edit meetings that you have created yourself. If the "Show my course meetings only" checkbox is selected, meetings that you cannot edit yourself will be hidden.
To edit your past meetings, click on the topic label of your meeting in the "Topic" column, and scroll down until you see an "Edit this Meeting" button at the bottom of the page. Clicking on this button will allow you to change the data of your meeting as you wish. Save your changes by clicking on the "Save" button to apply them.