If you have lost your BlogEngine’s admin password then, there’s a quick cheat. If you’re using xml to store data (which is the default) then open App_Data/users.xml file. You can now see all the users with their password in encrypted format. Replace the admmin user’s password with the following (without the double quotes)
Now log in for this user with the password as “admin” (without the double quotes)
Once logged in, you can then reset the password.