Press the heart on a product page to save it. When you are signed in, favourites are stored in your account (Account → Favorites) and follow you between devices; there is a cap on how many you can keep, and the page tells you when it is full — remove a few to save more. Without an account, saved items are kept only in the browser you are using. Favourites do not reserve stock or lock the price — both come from the seller’s live listing when you order.
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Still stuck?
Open a support ticket from your account, or ask the assistant at the bottom right — it uses the same articles and can look up your orders when you are signed in.