I had to deactivate all of my plugins and activate them one-by-one and when I did this plugin didn’t come back properly. There is no SETTINGS option on the plug-in page. The only setting is activate/deactivate. I have deleted it and downloaded again several times and that has not helped.
Please make sure all products have weight and dimension, and you need to enter the WebtoolsID in the plugin settings under the user name field, if you don’t have webToolsID yet you can register with USPS and they’ll provide that detail.