Where is the picture now? Is it in My Pictures or in a photo-editing program?
What format is it? Is it a jpg?
If it is in My Pictures:
>open a Word document
>click Insert
>cl Picture
>from file
now, indicate the location of the picture and the name
>click Insert
>click Close
give the Word file a name
>right-click on the picture
>choose "format picture"
>choose the "size" tab
set your dimensions
If you want to print on a 4x6 photo paper:
click File
>Page Setup
set margins accordingly
>if the picture doesn't fit, right-click, format picture, size.
If the picture is in a photo-editing program and not in jpg format:
>bring up the picture
>click File
>Export As
>give the picture a name
make note of the location
at the bottom of the window, be sure to click the down arrow to select jpg format.
>then follow above instructions.