Not allowed to push to protected branches

Hello again.

im trying to do the push of a ctf challenge trought Netbeans IDE, but when i try to do the push, this message appears:

GitLab: You are not allowed to push code to protected branches on this project.

i also got my remote branch created, and in the past i achieve the upload of a programming problem, so i dont know what the problem could be. can you help me?

Duplicate of 339