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Open the screen that you want to capture. Open the Notification panel. Tap the "Quick Memo" or "QMemo+" button to take a screenshot. Draw or write on the screenshot with your finger. Add a reminder to your memo. Save the screenshot to your Gallery. Share memos by tapping the ⋮ button and selecting "Share". Find your memos using the QuickMemo+ app.
You can use the QuickMemo+ app that comes preloaded on most LG devices to capture and annotate screenshots. This can come in handy if you want to make a note on a map, or highlight certain text on the screen, or just doodle. Swipe down from the top of the screen to view the Notification panel. This button is usually located in the upper-left corner of the open Notification panel.  While QuickMemo+ comes preloaded on most LG phones, your carrier may have removed it. If you have a custom operating system installed on your LG phone, you may not have QuickMemo+. Even though the Notification panel is open, the screenshot will be taken of whatever is underneath it. You can write out words, circle something, doodle, or whatever you'd like to show. You can tap the "T" button to type text onto the picture. When adding text, you can change the font style or add checkboxes by using the tools that appear above your keyboard. Tap the small "Add reminder" button in the bottom-left corner and select the date and time you want to be reminded of the memo. Tapping the Save (disk) button will save it to QuickMemo's storage for easy access. A list of available sharing options will appear, based on the apps that you have installed on your LG phone. Sharing a memo will save it automatically. If you want to look through all of your saved memos, you can do so with the QuickMemo+ app. Open the App Drawer on your LG phone and tap "QuickMemo+" or "QMemo+". This will load a list of all of your stored memos.