Array modifier offset problem

I’m trying to assign array modifier an offset so that I’ll be able to rotate around. But I couldn’t manage to do that. It probably has a simple solution but I couldn’t find it via searching. In order to explain my problem, I captured a very short video. Please tell me what I am doing wrong.

You don’t make it easy for anyone to help you. Also please supply a link to your .blend file, make it much easier to test than a video that may miss out important information

Sorry, I forgot that I’d changed the default privacy to that. Changed it to normal now.

Note location of the object origin

Thank you!