Go to Seller Admin>View/Edit/Delete Products:
Select an existing shippable product of yours and click Edit;
On the first screen, if Shipping/Buyer's Address is not checked there, tick that box;
Click Next until you can click Submit to save settings;
Repeat this for all your tangible goods;
When adding new shippable products, remember to enable Shipping/Buyer's Address.
Go to Seller Admin > Cart Shipping Settings and set up the following:
Shipping Origin: select United States and enter your zipcode;
Shipping Destinations: select only United States, Canada, and United Kingdom (hold down the Ctrl key on PC or Command key on Mac to select multiple countries in the list);
Leave all other settings blank or 0.00;
Click Next to save settings and proceed to the Shipping Rules screen.
In the Existing Shipping Rules menu, select and Delete any Rules you may have saved there.
Set up your first Shipping Rule for Domestic shipping:
Shipping Rate Calculator:
- Flat (if your rate is for orders of any size)
...or...
- Price per Unit (if your rate is for each item)
Shipping Amount: 6.99;
Country: United States;
Click Submit to save the Rule.
Add another Rule to cover the other countries:
Shipping Rate Calculator:
- Flat (if your rate is for orders of any size)
...or...
- Price per Unit (if your rate is for each item)
Shipping Amount: 19.99;
Country: All Countries (this covers all countries you'd selected in Shipping Destinations that don't have a specific Rule of their own);
Click Submit to save the Rule.
Click Back to Admin, and you're done! :^)