Re: Please show screen where I can enter billing information.
HI Midge E
Welcome to the AdWords community :-)
All payment and billing information can be carried out within the Billing tab, once within the billing tab, you will see the billing settings and billing profile links in the left hand navigation panel.
I'm including some articles about the billing tab and how to complete various tasks within-
How you pay for AdWords (Automatic or manual payments)
I hope this helps you, please post back if you have any further questions