How to re-open an issue in GitHub?

I have reported an issue to a project. Now the owner changed its state to closed. How can I change it to open again?
I read somewhere that I need rights for push and pull operations. Is that true?

Github has very simple rights/privileges (and even simpler management for them).

If you are not a collaborator of a repo, then (in regards to issues)

• you can open issues
• you can comment on all existing issues (open or closed)
• you can close your own issues
• you can re-open your own issues if you closed them yourself
• you cannot close or re-open issues opened by someone else
• you cannot re-open your own issues if a repo collaborator closed them

The situation you report falls in the last case, so you cannot reopen it. You can ask in the issue thread if a repo collaborator can reopen it, or you can open a new issue and reference the old one (by mentioning its number preceded by a hash sign, e.g. #123).