I know however (as several of you have told me!) that it can be problematic working out how to comment. So here's how it works...
You will need a google account in order to comment. It is very easy to set one up at https://www.google.com/accounts/NewAccount
Once you have done that you are all set to comment on any blog - not just mine! After reading the blog post you just click where it says comments - even if it says 0 comments - and it opens up a box where you write. You then choose google account as your profile and click post comment.
Go on - have a go here!