Things You'll Need
Instructions
Open your image in Adobe Photoshop.
Select the "Magnetic Lasso" from the left hand tool bar.
Outline the edges of your subject using the magnetic lass. Try to stay as close to your subject as you can.
Choose "Select" and "Inverse" to invert your subject. This unselects the subject and selects the background of your image.
Open your new background image in a new window.
Press "Control + A" while on the new background image to select the whole thing.
Right click on the selected background and choose "Copy" to send the image to the clipboard.
Click on your original image and select "Edit" and "Paste" to replace the background of the image.
Select the "Move" tool from the left hand tool bar if you need to adjust the placement of the background image.
Save the picture as a .jpeg by selecting "File" and "Save As."