I have a small 4" x 3" photo.. When I scan it , It shows up on a page that is a lot larger than the picture in Inkscape. How do I seperate the photo from the white page.  

You can try Extensions->Raster->Crop with these numbers and hit "Apply".

I did as you said . clicked  apply now I just have a white blank page. 

I used your uploaded PDF. Perhaps open it in GIMP and do the crop there.

(image deleted on request.)

thanks for your help.. I just saved it and sent it that way.

Shall I delete the image because it´s a private one?

sure. can you tell me step by step how you were able to do that process?

Thanks

As I said: Extensions->Raster->Crop - adjust the values that work for you - then hit Apply (image must be selected of course). Then Right-click->Extract image and save.

May be this?

Raster extensions do not work after upgrade to Inkscape 1.3 (#4535) · Issues · Inkscape / inkscape · GitLab

Works here with 1.4beta/macOS.

Broken here with 1.4beta/Win11.