Change the link of "Go to shop" button

Hi,

I have 2 issues I would like to address:

1) Private status make the product not purchasable?
I have a few products which only customers who visited the following website instead of visiting my website directly can purchase.

I set the redirect link to the purchase button.

Since these products are only available for landing page visitors,
I set those products’ status as “Private”, so that customers who directly visited my website
can’t see the products.

However, when I set as private, I can’t put the products into the cart when I clicked
the purchase button on landing page. Private status make the product unable to purchase?

2)How do I change the link of “Go to shop” button?
Please see the attached document for the details.

Please kindly let me know how I can fix those issues.

Thank you.