How can I green screen in Photoshop? I am making a picture were I need to green screen, and it would be very helpful if someone could help me!
If it's only 1 image and the subject is not extremely complicated (outline is relatively simple) than I would make a path around the subject and then make a selection out of that. Then hit Select -> Refine Edge and play with the settings there until you get a good separation from the background.
If you want to go full auto, check out this great tutorial: http://www.photoshop.com/tutorials/4082
You can use the magic wand tool to remove it. Search on youtube "removing backgrounds using the magic wand tool" and you will see tons of them showing you how it's done. It's not that difficult. I also know that for after effects you can remove it using the key light plugin and it is very easy to do so as well I learned that here: https://www.udemy.com/learntvads. But back to your question on photoshop it can be done with the magic wand.