"Signing up" just means giving us permission to work inside a folder in your existing OneDrive.
Here's a quick explanation of the permissions we'll ask for, and why we need them:
|We'll ask for:||So that:|
We can find your name & email address to use on your blog.
We can publish your changes automatically.
We can make a folder in your /Apps directory for your blog, and upload some starter content for you.
Remember, we don't get access to any of your other OneDrive data or files.