username as email address

First thanks a lot for your great support
i have seen an old post here regarding the topic. but i cant get it work. So here i want
1. in login page : " email address " instead of "username"
2.registration page : no username

sry ignore this topic as same topic is open here www.hikashop.com/forum/23-market-how-to/...s-email-address.html
dont know how to delete this post