找到“Print Screen（全屏截图）” PrtSc键。 如果有必要，找到Fn键。 确保屏幕正在显示你想要截屏的内容。 按PrtSc键。 打开“开始”。 打开“画图”。 粘贴截图。 点击文件。 点击另存为。 选择图片格式。 输入文件名。 选择保存位置。 点击保存。

Given the above summary, write a detailed text in English for it.
The "Print Screen" key will be in the upper-right corner of the keyboard next to the Delete key.  If your keyboard has a number pad on the right side of it, you'll find the prt sc key left of the top row of keys in the number pad. Note whether or not the "prt sc" (or similar) text is at the top of the key or at the bottom of the key. If it's at the bottom of the key underneath a different text option, you may need to use the Fn key as well. If the "prt sc" text is at the bottom of the key and below some text instead of at the top of the key, you'll need to use the Fn key to force your computer to recognize the Print Screen function. You'll usually find the Fn key in the lower-left side of the keyboard. Go to the page or program in which you want to take a screenshot. Doing so will copy a screenshot of your screen's contents to your computer's clipboard.  You won't receive any visual indication that a screenshot has been taken. If the "prt sc" text is below another text item on the Print Screen key, make sure you hold down the Fn key as well. Click the Windows logo in the bottom-left corner of the screen. Type in paint, then click Paint at the top of the Start menu. Press Ctrl+V to do so. Your screenshot will appear in the Paint window.  You can also click the clipboard-shaped Paste icon in the upper-left side of the Paint window to paste in the screenshot. If your screenshot isn't pasted in, you may need to go back and take a screenshot while holding the Fn key (or, if you held the Fn key, not holding it). It's in the upper-left side of the screen. Clicking it prompts a drop-down menu to appear. This is in the File drop-down menu. A pop-out menu will appear. Click either PNG or JPEG in the pop-out menu. Doing so opens a File Explorer window. Ideally, you'll use the PNG format here as PNG files don't lose quality over time (unlike JPEG files). However, JPEG files take up significantly less space on your hard drive. Type whatever you want to name the screenshot into the "File name" text box near the bottom of...