Just switch your browser and it will work if you are not signed in. If you are signed in sign out and continue as a guest as the 15% savings is still worth more than the credit they give you.
Signing out and clearing cookies and cache didn't work, but since I work in IT I have no idea why simply using another browser didn't cross my mind, lol. My wife has her own account so we can get two orders and keep points as well other than they are split between two accounts. Pretty rare to need a third order, but sure enough, I'm wanting a third already this month!! Maybe my daughter needs an account, she has one of my credit cards in her name so she could at least put it to good use! Yep, I have a plan now