Hi @Caglar KIZILBULUT ,
Contact Atlassian Support directly from https://support.atlassian.com/contact/#/.
Select "Billing, Payments and Pricing" under "What can we help you with?"
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What steps are you referring to? The Community is a great place but not all info here is accurate for various reasons including changes in the products sine the post was made.
What exactly are you trying to do? If you simply want to access the billing page you need to be sure that you are listed as a billing contact.
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