Once that's done then you'll be able to sign in, make a New Post or comment on others. To add a comment, either click on a post title or Comments (or No comments if you're the first) at the bottom of an entry.
The pencil icon will only appear on your posts. This allow you to edit what you've written or even delete it!
Because a Google account enables sharing across a wide range of spaces you may see suggestions that your entries can be shared on your Google+ profile or elsewhere. You can do so if you wish but it's not necessary for the Toolbox project so cancelling those 'Share' options is OK too.
There are helpful notes for setting up an account on the How to use this blog page or if you get stuck e-mail me and I'll try to help.
