You can set your links' affiliate code(s) by following these steps:
1. Hover over Settings in the menu at the top of the page
2. Click on Pen Name Settings.
3. Click on the Default Affiliate Codes tab
4. Enter your affiliate code for each country/marketplace.
The codes you enter here will be the default affiliate codes for your links.
If you'd like to edit the affiliate code for a link you can go to the Book page, click on the Links tab, and then click on the edit icon. You'll be taken to the edit page where you can change the code to whatever you'd like. You can also set up your Facebook Pixel here if you use it.
When readers click on any of these links the affiliate code will fire off automatically.