The link from the Widgets section is not working. Use the link from the Settings in the left navigation of the WP admin.
I will upload a fix for the broken widgets link later today.
Hello,
In updating the plugin today this bug was introduced. Apologies, but it has now been fixed and the plugin is back to normal operation and working properly.
You will need to update it/reinstall and it will be OK.
Thanks,
CookieCert