Walmart site to store?

I’ve seen people order from Walmart and have things SHIPPED to the store not just a pick up how do I do this? I want to buy pregmate test online and have it shipped to the store for me to pick up reason I don’t want to have it shipped to me is because I don’t want other people that live with me open my mail and see it it’s something we want private and I thought it was simple I called my local store and asked if they did this and they said they do but I can’t figure it out it’ll only let me do my home adress