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Login into WordPress using 'admin' username
Goto Users > All Users
Click 'Add New' button at top
Enter new Username
Enter any different email address, can be changed later
Enter strong password with mix of numbers & alphabets
Select 'Administrator' option from 'Role' drop down box
Click 'Add New User' button
Now logout from WordPress
Login using new username 'basicwp' instead of 'admin'
Goto Users > All Users
Click 'Delete' under 'admin' user option
Select 'Attribute all posts to 'basicwp' - be careful, don't select Delete !
Then click 'Confirm Delete' button
Now default administrator username is 'basicwp' instead of 'admin'