Hey,
Follow the below steps for a SQL Account:
Execute the below query on master database
create login [login] with password = ‘<<>>’
create user [login] from login [login]
exec sp_addrolemember 'dbmanager', 'login'
exec sp_addrolemember 'loginmanager', 'login'
Then create the same user in the individual database and make it as db_Owner by:
create user [login] from login [login]
exec sp_addrolemember 'db_Owner', 'login'