If your username is “admin,” you need to change it right away. “admin” is the most commonly-used username in cyberspace and the one hackers try first when hacking a site.
Sometimes it is assigned to your account when you installed WordPress ,or you might chosen it. Either way, you have to change it.
Be careful if you change it to something easy to remember. For example, if your name is “Bob Smith,” you might be inclined to make your username “bsmith.” But, it is not too difficult to find out who owns a website, and so if “admin” doesn’t work as a username, hackers will probably try different ways of writing the owner’s name. So. use random numbers after your name, such as “bsmith3948.”
There are several steps involved in changing your login username, so you might be best consulting your developer or web hosting company. If you want to try doing it yourself, check out this video: