Hey @michalw ,
First you need to change the link to the button, paste this and click on the link that shows
#shopify-section-template--20517651939652__featured-collection-0
Then you need to do this,
Go to your theme’s “Edit Code” Option, then in the search bar type “theme.liquid”
Below the tag “” tag paste the following. Screenshot attached for reference.
Screenshot is for reference only, the correct code to paste is the one shown above.
