Login to mysql shell and key in :

For Local users

mysql> grant all on database.* to username@’localhost’ identified by ’password’;
mysql> flush privileges;

Verify the connection by executing the command from bash prompt: 

mysql -u username -p databasename

For remote users :

mysql> grant all on database.* to username@’%’ identified by ’password’;
mysql> flush privileges;

Verify the connection by executing the command from bash prompt. 

mysql -u username -p -h hostname databasename