Open and sign in to the Waves.Exchange dapp here, click on Investment in the top orizontal menu and then click on button Start Leasing.
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 (more or less a day).