If you want to change your traditional auto loan to lease financing, this is not going to be possible. If you are looking at this page, then you might be struggling to pay your monthly payment on your traditional car loan and thus wanting to save some money and pay as a leased car.
Unfortunately, you can not switch from a traditional car loan in the middle of your contract to a leased financing agreement.
This is a highly unusual request and not possible. I do not know of any auto financing company that would ever consider changing your traditional auto loan to a lease.