it sounds great,but if i lost my password and forget my account ,how can i find them back ?
Maybe look in your history for references to your account name? Otherwise, check your email accounts. I haven't used this exchange but i'm pretty sure almost every exchange (including this one) sends out a confirmation email to confirm your account before you're able to use it.
Not that it matter very much, because this exchange is dead. https://exba.se/ doesn't work.
http://www.isitdownrightnow.com/exba.se.html
The domain registar info also doesn't give much confidence..
https://who.is/whois/exba.se
Seems like they've already shut down?
Seems like they moved domains to here,
https://exbase.net/login still, the site looks sketchy at best.