Please read the instructions mentioned on the following website for obit to vimple transition: https://vimple.openledger.io . I think there is lots of useful information on this webpage. bottom line however, is its very simple to send OBITS to VPLedger and then spend it now for LTM and later for SaaS related products and services.
as you will read there also you send from your BitShares network account your OBITS and make sure it says in memo what is the account name on the testnet of VPLedger.
I hope that was useful, thank you for asking
account : vpledger memo: your account name on VPLedger