I'm not very familiar with Bitco.in website, but seems it's another Bitcoin forum. So, probably you're asking in wrong place about your issue. I guess it would be best to contact admins of this forum, maybe they will help you to recover your account.
I think the site OP is trying to refer to is freebitco.in
Bitco.in is another unpopular forum which seems to have been created to shill Bitcoin Cash and bash Bitcoin according to what I am seeing on the front page
@SeraaMasumi try contacting Freebitco.in's support (I don't know why they don't have contact links on their website, yet they are one of those old crypto related websites)
TheQuin is always active responding to issues in
Freebitco.in's gambling thread, maybe you can post your question there or PM him