Open and sign in to the Waves.Exchange dapp here and select the option Leasing in the menu Wallet.
Click on the button Start Lease and compile the fields.
In the Recipient field insert 3PGfXB5bEz7EkbtGMNUYop5aior5X6bUbvL or waveslease
In the Amount field insert the quantity of WAVES you want to LEASE minus 0.001 WAVES (the fee).
Click Start Lease: your lease will be Active after 1000 Blocks (a day more or less).