I have reported an issue to a project. Now owner changed it state to closed, but how can I change it to open again ?
I read somewhere that I need rights for push and pull operation. 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)
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
).