Hi Welcome to JustAnswer
I could not understand your question clearly. DO you need help in login to American Express Account ? This link :- https://global.americanexpress.com/myca/logon/emea/action?request_type=LogonHandler&Face=en_EI
It seems you need to add your American Express card to be added to Apple pay
ok. Got you.
Please tell me your email id , I will send you instruction over there .
Just sent you an email. Please check it.