Hotel Chocolat you order as normal and when it's delivered go on to your account and cancel, you only need to get the first box. After I bought I went straight to account and changed my subscription to 12 weekly which gave me a lot longer to cancel if I forgot (but went on and cancelled when it arrived)
Topcashback you go on to that website first and search for the website, click through there and shop normally. Then you get cashback in three stages
Tracked - we can see you spent £x on that website
Confirmed - that website has agreed and have said they will pay
Payable - we've been paid and will now pay you
Once it's payable you can get BACs payment, PayPal, Amazon vouchers etc to take the money out, up to you
Hope this helps Taffeta ask if you have any other questions