You received your account number in an e-mail upon registration.
You can find it in the option Ticket on the right side and by positioning the cursor on your username in the drop-down menu as the Account Number.
The Account Number is a unique number of each user registered on Meridianbet betting web site.
Meridianbet online betting account can be created in the option Registration.
The account is created based on personal data from identification documents.
Your username is your e-mail address from registration of the Meridianbet account.
The way you entered your username and password for the first time, in registration, regarding lowercase or capital letters, shall be the only valid way for each login attempt you make on Meridianbet site.