Choose 'Wishlists' at the top of the page. Under 'My Wishlists' you will see a '+'. Click on it, where you will be presented with three options when creating a new wishlist:

Choose 'Together with others' (collaborate on a wishlist). Here, the user creating the wishlist must invite the other user to collaborate on the wishlist. By clicking on 'Add collaborator', a list of suggested collaborators will appear. Choose the desired collaborator and click 'Create wishlist'. The invited collaborator will then receive a notification that they have been invited to collaborate on a wishlist, which they must accept.
Both users will now have the ability to add wishes to the wishlist. The wishlist will also be available on both profiles.
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​Note: It is possible to have up to 10 collaborators on a wishlist.

If you wish to collaborate on an existing wishlist, choose the desired wishlist and click on the icon with the three black dots and select 'Manage collaboration', where a list of suggested collaborators will appear. Choose the desired collaborator. The invited collaborator will then receive a notification that they have been invited to collaborate on a wishlist, which they must accept.
Both users will now have the ability to add wishes to the wishlist. The wishlist will also be available on both profiles.
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​Note: It is possible to have up to 10 collaborators on a wishlist.