How to make onboarding easier? HELP!

I am having the hardest time setting up my account. I can't seem to get in contact with customer service, I am unable to update my payment information or validate my account and I have a guest checking in shortly. Does anyone have any idea on show to smooth out this process or how to contact customer service?

I have checked my in box as suggested by the article but there's no way to submit a question either.