I believe you can log into your ebates account and link your AMEX and it will automatically switch it to MR points, but I may be wrong.
EDIT: It appears that to link your AMEX account, you first have to cancel your existing Ebates account and then create a new one.
You just need to create a new Rakuten/Ebates account using a new email address. Pretty simple! and after that link it to your Amex account for MR.
Honestly, this site is pretty addicting. Unfortunately, I’m a tightwad and find it hard to buy anything I don’t need in general, but this is definitely a way to get me to open the wallet up a bit.
I'm not a tightwad by any means, but I have realized that I need to curb my spending. So I should probably stay away from this Awesome site!
Sadly I won't...
But it would be nice to earn some extra points on my spend!