What is required from my FreshBooks account
You must enable API access for your account and then you’ll be given a unique authentication token. The admin user, and each staff member, has an API token. Note, using the Freshbooks Admin API token with this plugin will return the number hours billed by the Admin user and all the Staff accounts associated with the Admin account (the entire team), whereas inputing a Staff token will output the hours billed by that staff user only. See http://developers.freshbooks.com/
I'm getting a warning?
Note: PHP will produce a warning if it is operating in "safe_mode" which will look something like this: Warning: curl_setopt() [function.curl-setopt]: CURLOPT_FOLLOWLOCATION cannot be activated when in safe_mode or an open_basedir is set in /home/public_html/wp-content/plugins/freshbooks-widget/library/FreshBooks/HttpClient.php on line 79
Check with your host provider to turn-off "safe_mode" if this warning appears.