For International Orders:
Use the Shipping Rate Calculator drop down and choose Flat. Set the amount at 8.00, leave the description blank. Nothing else needs to be changed, just click Submit and the shipping rule for international orders is ready.
For Domestic Orders:
Free Shipping:
Use the Shipping Rate Calculator drop down to choose Flat. Set the amount at 0.00, enter Standard (or something similar, you only have 10 spaces though). Now set the Country drop down to United States and set the Max Item Total to 75.00. Finally, click Submit to save this rule.
Upgrade to Priority:
Use the Shipping Rate Calculator drop down to choose Flat. Set the amount at 5.00 and enter Priority in the description field. Once again set the Country to the US and the Max Item Total to 75.00 and then click Submit
Orders over $75:
Use the Shipping Rate Calculator drop down to choose Flat. Set the amount at 0.00 but leave the description field blank. Set the country to US and set the Min Item Total to 75.01 and click Submit.