can u answer me on email pls

Please note that, the login email and password are case sensitive. 

If you forgot the login email or password  and you have access to DB, You can run select query in res_users table as below:

Select * from res_users

You will find all users in the system then you can update the password for the user you want by getting his id from above query results as below:

update res_users
set password="NEW_PASSWORD"
Where id = [ID_OF_THE_USER]

You can get  ID_OF_THE_USER from the id field of the first select query.