how do I get permissions to save a file?

After I make a file, I try to save it, but it says I do not have permissions to do so.

Don’t post multiple times. If you made a mistake, edit our question. Delete the duplicates at 271760/how-do-i-get-permissions-to-save-a-file, 271761 and 271762.

Edit your question to mention LO version and OS name. Have you recently made a system update?