Resize Tutorial

Step 1 Hold down the apple key and tap the letter t. this will create a box that surround your image 

Step 2 Hold down the shift key and drag one of the corner edges  in to make your image smaller . Drag it out to make your image bigger.

Step 3 Click the enter key on the far right hand side of the key broad to let photoshop know that you are finished resizing your image.