Viewfinder on my nikon D40 moves what do i do?

The viewfinder on my nikon D40 moves what do i do?

Do you mean it moves all around the photo or the red dots change different places? Explain your question with more detail, I don't understand what you're asking

Is it just the eye-cup (rubberish mount) if so you should be able to find a replacement quite easily and cheaply. If it's anything more than that, then I'd suggest you try a local specialist camera shop and get their opinion. Just keep an eye on cost, and if it's too much, then it may be time to keep you lens(es) but move up to a more modern camera body.