Here's a step by step guide to help you sign up and claim your Chargebee account.
1. Sign up for a sandbox account with your email address here.
2. On submitting your email address, you will be logged into a Test site. The URL will be something like "your-site-1234.chargebee.com". You will also receive a verification email.
3. The verification email will consist a link that allows you to complete setting up your account.
4. You can now claim your account and also specify a domain name. You can set a password to access your account. Learn more.
5. After you've claimed your account, you can log into your Chargebee account with your email address and password.
Here's a video for your reference.