When backers select any reward they want to pledge for, they will be redirected to the page where they can choose their Add-Ons and fill their shipping address. 

• At first, the backer has to select any reward they want to pledge. Then the backer will be redirected to choose their Add-Ons. After clicking on “Continue”, the backer has to fill in their shipping address. Here, backers can also check their total they have to pledge. 
• Later, they will be asked to put their payment info for pledge.

Make sure you carefully double-check your address to prevent any issues or delays in getting your reward. Make sure you include all the information required, including the city, zip code, country, street 

Contacting the creator directly is the best course of action if you have any trouble giving your shipping details. You may message the creator from the project page, which features a dedicated communication channel.