when choosing my address book, I keep getting the following message:
There seems to be a problem. I'll tell you what... let us fix it and this can be our little secret. Please wait 30 seconds and try again.
403: Could not sign user in.
how do I fix this?
Try clearing out your browser's cache/browsing history. When you have done that, close out the browser and re-start it in a fresh session. If that doesn't do it, then try using a different browser.