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Moved from the Creative Cloud to the InDesign forum. They will be able to help you here.
If they were created in the master page that is assigned to each page in the document, just delete it from the master page.
There's something about the way you asked that question that suggested to me that you're new to InDesign. You might want to check out an excellent but inexpensive book about InDesign which might help beginners to InDesign: Sandee Cohen's Visual QuickStart Guides for InDesign. You haven't told us what version of InDesign you're using but here's a link to the latest version (Sandee has published the book for earlier versions as well):