Its just simple. Click on the FILE menu.Then select OPEN . It will display a dialogue box in that click BROWSE to search for u r image .After selecting it click OK .then selected image will be added to your PHOTOSHOP continue opening many files and start u r collage work.

Hope this helps u. :)

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IT'S ok. But I need it step by step that is an answer for 25 marks....
Open the first image in Photoshop by clicking "File", then "Open", and browsing to it. Double-click it to open it in your workspace.Open the second image by repeating the process, which will cause it to tile on top of the other image.Click the "Select" menu at the top of the screen, then choose "All". Press the "Ctrl" and "C" keys to invoke the copy function. Click back to the first image, then press "Ctrl" and "V" together on your keyboard to paste the second image directly on top. Click the "Move" tool, which looks like a black arrowhead with a cross mark, on the "Tools" palette, then drag the imported images into place.
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