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Your site is private so it's not possible for us to see what you already have on your site and on the page you are calling your "contents" page. But you can create a simple listpages module of the pages you have created on your site with:

[[module ListPages category="*" created_by="=" separate="no" perPage="50"]]
%%title_linked%% - created by %%created_by%% on %%created_at%%
[[/module]]

Go to the page that you wish to delete, click on "Options" at the bottom of the page, then choose the "Delete" option:

Make sure to set it to "Delete Completely" if you want to permanently remove the page:

If you think it's possible that you might want to use the page again in the future, or keep a copy of the source code, only rename it (which moves it into the 'deleted' category). Then you can explicitly tell a ListPages module not to display any pages in that category.