Head to TurtleNetwork DEX and sign in to the wallet you have leased TN fromStep 2.
Go to Wallet >> LeasingStep 3.
Open the options menu (3 vertical dots) on the lease you want to cancel, and select "Cancel Leasing"Step 4.
Click "Sign" and then "Send" to confirm cancellation. The lease should immediately show as 'CANCELED'
SpaceNode leasing address:
Or just use the address alias: spacenode