There are a few different ways that you can log into your Google AdWords account.
The first way is to log in with your Google account. If you have a Gmail account, you can use that to log into AdWords. All you need to do is go to the AdWords homepage and click on the "Sign in" button. From there, you will be able to enter your Gmail account information.
Another way to log into AdWords is with your customer ID. Your customer ID is a unique number that is assigned to your AdWords account. You can find your customer ID by logging into your account and clicking on the "Settings" tab. Once you're in the Settings tab, your customer ID will be listed under the "Account information" section.
If you're still having trouble logging into your account, you can always contact Google AdWords support for help.