Hi Carol. I typically just do a google search for the company and it should say careers on their home page. You can then click that and search for open positions in your area. Here is the link I found for American Express.
https://aexp.eightfold.ai/careers?intlink=us-amex-career-en-us-home-findalljobs

If you don't have a resume to apply for, here is the link for you to explain how to create it. Good luck.

https://www.jobcase.com/articles/instant-resume-on-jobcase