Birçok kez denememe rağmen hata aldım ama sorunun ne olduğunu bilmiyorum ve mezuniyet ayını ne girmem gerektiğini de anlamadım. Branş seçiminde tam olarak bölümümün branşı yok (bölümüm grafik tasarım) en yakın olanını işaretledim belki hata o yüzdendir bilmiyorum.
you can try adobe support, but it looks like you need a different payment method.
there are 2 ways to contact adobe support; chat and twitter (now x):
chat: if you have or want to purchase a subscription, use a browser that allows popups and cookies and click here, https://helpx.adobe.com/contact.html?rghtup=autoOpen in the chat field (lower right), type AGENT be patient, it can take quite a while to reach a human.
twitter/x: tweet @AdobeCare
p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative.
As I understand you are trying to purchase a student plan and are unable to do so becuase of a wrong selection. I would suggest you to kindly get in touch with Adobe support( Link shared by @kglad) for help. They will be able to assist you in ourchasing the plan.