Hi, how do I set shop that the buyer have to pay postage (sending) for all orders that are below Total Price 1260, all over that to have free postage.

I have a technique in shop and sending by mail.

In modules/shipping I only have to set:

Calculation Method
Calculate cost based on Weight, Price or Item
I select - Price

I don't know what to put in?

Zone 1 Shipping Table
Shipping rates to Zone 1 destinations based on a group of maximum order weights/prices. Example: 3:8.50,7:10.50,... Weight/Price less than or equal to 3 would cost 8.50 for Zone 1 destinations.
You can end the last amount as 10000:7% to charge 7% of the Order Total