Corendon Airlines Booking Name Error - How Can I Correct My Ticket?

I really need your help. I made 2 reservations for flight 23. 07. I didn't specify the name correctly in the first one. Instead of the full name Mariia, I indicated Masha. How to fix it? How serious is the mistake? What are the company's rules in relation to this? In the second booking, I missed the letter in the last name. You need to write Ab***, but I wrote Ab*** incorrectly. I'm really counting on your help.