In fact this is a very important question. Basically you send your unstaked EOS you want to lease out to their smartcontract, once the lease is taken you will get the fees for the lease at once. In the first version, you will loose your voting rights, but its said it will be possible later one.
Btw. my final article on trybe covers those things: https://trybe.one/chintai-eos-leasing-coming-out-of-the-jungle/