Remove default admin account?

[evilnone]

Is there a way to remove the default admin account after I give admin to another user I created? I ask because I am having someone trying to crack my admin account and would like it to be removed as I have another account I have given admin rights too. Also is there a way I can IP Ban the incoming attack? This is on a hosted server and not local or I would just IP Ban from my router.

Thanks in advance!

[GJ51]

Most routers have the ability to black list traffic from a particular site. Check your documentation.