@sharletsings123 have you run ./nodebb setup? It should have created a config.json file. Can you copy or take a screenshot of the complete output of ls /opt/nodebb? There should be a lot more directories and files than that.
Sorry to take time to reply the ./nodebb setup had errors so I wanted to delete the directories but I restarted again its fine for me ill say you if I have any problems through a DM or here!!