If you want to repost a picture originally posted on iFunny, the easiest way to save it to your computer or smart phone is simply to tap on the "Save" icon below the picture.  The "Save" icon looks like a small folder with a downward pointing arrow on it. Note that this only applies to images you are reposting from iFunny. If the photo you want to repost is from another website, you will need to take a screenshot or screen capture. To take a screenshot of an image on your iPhone, you need to press the "home" and "lock" button at the same time.  Navigate to the image you want to repost. Center it on the screen so that the entire image can be seen. Hold down the "home" and "lock" button simultaneously. You only need to press these buttons quickly. Do not hold them down for more than a second. You should hear a camera shutter sound after you release the two buttons. This sound indicates that the screenshot has been taken, and you should be able to find it in your "Camera Roll" afterward. To take a screenshot of an image you want to repost using an Android phone, you need to press the "Volume Down" and "Power" buttons simultaneously. This should work on Android 4.0 phones and any Android phones released after that.  Navigate to the image you want to repost on iFunny. Make sure that the entire image can be seen on the screen of your smart phone. Press the "Volume Down" and "Power" buttons at the same time. Hold them down until an animation appears on the screen to indicate that the screenshot has been saved. From that point on, you should be able to find the image in your Gallery, within the Screenshots folder. . The most basic way to take a screenshot on a Windows computer is to press the "Print Screen" button and to paste that image into Microsoft Paint.  Find the image you want to repost. Make sure that the entire image is visible on the screen. Press the "PrtScn", "Prnt Scrn," or "Print Scr" key on your keyboard. Open Paint from your Start menu. Once inside Paint, press "Ctrl + V" on your keyboard, holding...

TL;DR in Chinese:
保存Ifunny上的图片。 在iPhone上截图。 在安卓手机上截图。 在Windows系统中截图。 在Mac中截图。