Print 2 photos on A4

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I have searched various tutorials without success.
Can somebody please suggest a tutorial for me, or explain how to.............
All I want to do is to add 2 images to an A4 page one above the other.

I have opened a blank page and one image both as layers but I am unable to change the size of the image to fit the A4 and move it into position?

Help would be appreciated.