Feel free to say what you need to say, just be polite. You can give me feedback by saying what you want in comments on my blog, or add something on my forum. Do create an account though. It's free anyway. I've built this into the system to keep spam to a minimum.
If it's help you need, or if you have more personal questions, you can always send me a message through the contact form. For this you don't need an account.