Answered your question in another thread but here it is again. Ok open "Photoshop" once loaded click "File" and click "New" this will make a new white document for you to start your signature on. To import images from your computer you need to go to "File" and then click "Open", Find what image you would like to open and click "Open" the image should now be in photoshop.
Hint: When looking for images make sure it says Files of Type: All file format