You may well have heard all the buzz online about the attacks on WordPress security. Unfortunately this is no joke, and it needs to be taken very seriously, or all you've built could be hijacked or worse, lost to you.
fix wordpress malware protection will also inform you that there's no htaccess inside the directory. You can put a.htaccess record into this directory if you want, and you can use it to handle this wp-admin directory from Ip Address address or address range. Details of how you can do this are plentiful around the see this net.
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You first need to create a user with administrator rights before you can delete the default admin account. To do this go to your WordPress Dashboard and click on User -> Create New User. Then enter all the information you will need to enter.
Note that you should only try this step for setups. You need to change all of the table names within the database, if you would like to do it for installations.
But realize that security is. Do not just be the reactive type, take action to start today protecting yourself. Don't let Joe the Hacker make your life miserable and turn everything in creating come crashing down in a matter of moments that you've worked hard.