how to return leased aircraft?

[Aristotles]

I am in over $13 million debt, great for a brand new player I kinda get how it all works now... lol. I am selling one of my Boeing 757-200 to recoup costs and will be looking for a cheaper gate option than what I am currently raking in debt from a $300,000 month gate at Charles de Gaule, no brainer... a $300,000 monthly lease compared to a $93,000 revenue after expences paid! so I will have to find a cheaper location for a while, So back to my main question, How can I return an aircraft I leased?

[iranair777]

go to the aircraft in question and open it up and click end lease (or something like that)

also, you pay 300k for gates every 24 real life hours and get money every 1 real life hour. So you are getting 93k every 1 real life hour which equates to a profit of ((93,000 x 24) - 300k )= 1,932,000