Poss ol' buddy, been on Lazada for about a year, couple of days back I joined Shopee to see if prices and selection were any different.
I joined on the PC, think they used my email address, I put in a username but they ignored that and gave me their own, I did enter a password. It was all quite easy, in English too.
I then loaded the app on my phone, think it was just email and password.
Though after all that, I think I will stay with Lazada..????