After you locate icons online that you want to use to personalize your Mac, download them to your computer. Each icon set downloads as a disk image (.dmg) file, which is automatically converted to a folder when the download is complete. It’s not obvious, but you can edit directly from this view, even without unlocking the padlock on the bottom. For example, move the cursor over the icon and an “Edit” pops up: But don’t click on it. The process is even easier! Simply drag the image file from your desktop onto the existing user account icon photo picture.

Apple's standard lock-screen image with (and Yosemite before it) is a blurred version of your desktop wallpaper. If you have grown tired of this look, then you can add your own wallpaper. You can also add a message to your lock screen, which can add a bit of fun, motivation or information to your Mac after you log out. Lastly, you can change the user icon for your account and any other accounts you have set up on your Mac. Let's dive in. Add your own lock-screen wallpaper For best results, you'll want to find an image that is the same resolution as your Mac's display or resize a larger image to your Mac's resolution. To check the resolution of your display, click the Apple button in the top-left corner and choose About This Mac.

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Your Mac's resolution is listed on the Displays tab. After you find and download an image you want to use, you'll need to convert it to a PNG file format. To do so, open Preview and go to File > Save As. First, choose PNG from the Format menu at the bottom of the window. Then at the top, give the file this name: com.apple.desktop.admin.

The resulting file name must be exactly as follows: com.apple.desktop.admin.png. More Mac tips • • • Now, the next time you log out, you will see your custom wallpaper. If you change your desktop wallpaper, however, OS X will replace your custom image with the standard, blurred version of whatever you chose for your new desktop wallpaper. Although you will erase your sweet custom lock-screen wallpaper when you choose a new desktop wallpaper, it does mean that you don't need to bother with backing up the default file in the Cache folder when you replace it with your own image because OS X adds a new file to the Cache folder each time you choose a new desktop wallpaper. Add a message.

Screenshot by Matt Elliott/CNET Add a bit of wit, whimsy or information to your lock screen by penning a message. • Open System Preferences and click Security & Privacy • Click the lock in lower-left corner and enter your password to make changes • Check the box for Show a message when the screen is locked • Click the Set Lock Message button • Write your witty, sarcastic or informative message and click OK Your message will appear toward the bottom of the lock screen, just above the Sleep, Restart and Shut Down buttons. Download internet explorer 11 xp. Change the user icons.