Enabling Real-Time Rates
To set up Real-Time Rates for your store, go to "Store Settings" and select your store. Under the "Carrier Preferences", enable the toggle for "Enable real-time rates at checkout"
Shopify Users
Please note if you are on the Basic Shopify or Shopify plan and pay monthly, you will need to contact Shopify to add Real-Time Calculated Shipping (RTCS) to your store. Shopify charges $20 per month for this option and requires this in order to allow apps like ClickShip to work with your store and to maximize your use of the available features.
If you are on the Advanced Shopify or Shopify Plus plans or if you pay annually, Real-Time Calculated Shipping is included with your Shopify subscription at no additional cost.