Locate the Leasing Icon and click
This is what you will see.
Fill in "RECEPEINT" with: 3PEx3f3J5nXGaBXZ2RYijMEsZMFfBDgNhTb
Add your leasing amount: > 100 WAVES
Once you click the "Lease" tab,
you will see your transaction
by simply clicking the info icon to the right of your transaction confirmation and find the "Cancel Leasing" tab