Need help- regarding my posts...

Guys I need help with my old posts. I can open them but the "Edit" button is missing from that post and I can't make any changes in those posts.

Do I need to change any settings or do I need to request any one for the solution?

Please help me with this.

I did click on the "report" button in that post and sent a message but I didn't get any reply.

Let me know if anyone knows about this issue.