You do not tell other people, what do you want to delete. 
Hi @Sara-871c, welcome to the community! 
From your screenshot, this looks like a list in your app. The data is written to a row in one of your tables of your workbook, so you can delete the row in your table.
Are you also the builder of this app? If so, you can add a button to your list that allows you to delete particular list items (by adding an automation that deletes the context row). This is how it would look:
Hope this helps Let us know if you have any other questions. 