If you mean you want to use a computer as normal but it is protected by a K9 web protection password, this would be very difficult. There are some websites which suggest you can, but once a loophole is uncovered they will be tied up as soon as possible and other methods will have to be found. Parents see this product as very important in the safety of their children and so as a company, it will be priority to minimise the possibility of children being able to bypass the password stage.
If, however, you have simply forgotten the password which is set you can easily get into the account by resetting the password. If you go to www.k9webprotection.com, then click on instant support, type in forgotten password in the search window, and it will give you a link to reset your password. This will prompt them to send you a new password to the email address which is registered with them (so again this will not work if it is not your account).
K9 webprotection is designed specifically to protect children online and so the security in place is very high. If it was easy to crack the password section of this program, it would not be suitable for what it was designed for. Reviews for this show that it is very highly rated by those who use it, this illustrates that it is not easy to crack the password stage.