At that screen, you often need to press buttons in a certain sequence to get to the recovery menu. Try some button presses like the following:
1. Press and hold the Volume Down button, then tap the Volume Up button.
2. Press and hold the Power button, then tap the Volume Up button.
Try different variations of button presses to see if they work. Unfortunately, I can't find any published guide for stock recovery for the Optimus L9. There are more involved guides that require rooting, like this one, but I don't have the expertise to comment on them.