$10 Amazon Credit When change 1-Click Settings (Citi Card Required)

To get this deal:
1. Must do from a mobile device
2. Login to your Amazon account
3. Click here from your mobile device
4. Click "Change your 1-Click setting" to your Citi credit card and confirm as your method of payment
5. $10 credit will show up when you purchase those sold by Amazon.com and choose your Citi card as payment