See this article on how to rename bookmarks on IOS.

https://support.mozilla.org/en-US/kb/how-add-remove-edit-and-move-bookmarks-firefox-ios

See this article on how to customize your Firefox home on IOS.

https://support.mozilla.org/en-US/kb/customize-firefox-home-ios

Thank you. I found my bookmarks to go on the list of latest bookmarks. There is no edit button. But there is more folders and the system put the same bookmarks into one of the folders too. Each of the folders really has that edit button. Dont know how the system selects into which folder to put the new bookmark but now I found them anyway.