In backend event management, you will find it. It was not added to frontend event management until 2.8. It's just in the backend list of events... in each row that shows an event, date, etc... towards the right is a "Fee Ordering" link. It's been there since version 2.7.0... almost two years now
Unless you've modified the files or used a template override that affects the backend event listing, it will be there.