By signing up for a personalized address, you are expressing your desire to secure it on the IOV BNS Blockchain once it becomes live in Q1, 2019. By signing up, we will pre-register your personalized address for you.
If you do try to secure a personalized address that's already been pre-registered, the registration will not go through.
The first 200,000 names will be free. After that, registrations will require a transaction in IOV tokens.