Make sure the image is the correct size - remember, multiply the finished size in inches by 200 to get the pixel size.
Photoshop Elements > File > Print
With Photoshop this gives you another opportunity to size the image:
Select the print size
Or adjust the Scale, Height or Width to get the size you want.
However, it is better if you have the picture the correct size to start with so you can print at 100%. Every time you resize you lose some quality.
Check 'Center Image' if you want the image in the middle of the page.
Otherwise set the offset from the top and left side of the page that you want. (If you set both zero this will print in the top left corner. It should allow for any non-printable area on your printer, but test this with your particular setup)
Use 'Page Setup' if you need to change the size or orientation of the paper.
Now click 'Print'.
This will bring up the control window for your particular printer. Use this to set up your printer correctly - there are usually options to set the paper type (e.g. Glossy photo paper), which will set the dpi and other controls automatically.
If necessary, set the printer to 1440 dots per inch (or thereabouts) and check any other settings your printer may have.
Click OK then sit back and watch as your photograph slowly emerges from the printer.
Print the first photo in the top left hand corner.
Measure where you want the next one, relative to the top left corner, i.e. the offset from the left and from the top
Put the paper in the printer again and set the 'Position' accordingly.
Print as normal.
Repeat as many times as you have images.
With this method you can, of course, print the images at different times.
Use File > Print Multiple Photos
You will then need to select the photos you want, the size you want them, the number of copies and several other options including titles and borders.
Go to File > New
In the window that comes up, set resolution to 200 and the width and height to the size of your paper (210 x 297 mm for A4 paper).
This gives you a plain white image.
Open the first image you want to print. Make sure this is set to the same resolution (200 ppi) as you set for the blank sheet.
Use Select > All and then Edit > Copy
Go back to the blank sheet and use Edit > Paste
Using the cursor you can move this image around on the sheet until it is just where you want it.
Repeat for the other images and then print as normal.
NB. All images MUST have the same resolution for this to work (though they can be different sizes.
You will notice that each of the images is in a different layer in the palette on the right of the screen. If you want to move a particular image you must first select it by clicking on the appropriate layer. We will learn more about layers later.
It is quite likely that your printed picture will not look quite the same as it did on the screen - a bit lighter, darker or a slightly different colour. Getting this absolutely right is way beyond the scope of this course - most experienced digital photographers tear their hair out over it - but we will revisit it later.
If you have problems try printing a small test version first. If, say, the print is too light, darken it a bit in Photoshop and then print another test. If it's a bit too blue, reduce the blue in Enhance>Adjust Color>Variations. When you've got it right, then make your final full-size print.