Installing additional RAM on my Lenovo Flex 2 14 inch

In this tutorial, I will show you how to install additional RAM on Lenovo Flex 2 14". The RAM that I was using for this project is team elite 8GB DDR3 PC3L piece from team. It operates on 1600 MHz. On the laptop, there have already 4 GB RAM from Skynix.
The seller told me that it is OK to install them together.
So, lets do that!
I open the laptop case, and install the RAM on the available slot. Put the case back and run some test. The installation went success, and performance boost have been noted.
Please watch the video for more detail.

How to fix touchscreen not drag and drop when playing at chess.com live

Hello Everyone!
I just notice today that i cannot do the drag and drop action with my laptop touchscreen when playing live chess game at chess.com. I've looking the net for some solution but failed to find one.

For your information, I was using latest Mozilla Firefox. When using google Chrome, did not encounter this problem.

So, I went to look at Mozilla Firefox configuration, at about:config that will give out this kind of warning:

I went to click "I accept the risk" and searching for touch_event, and my screen looked like this:

I doubled click the key named "dom.w3c_touch_events.legacy_apis.enabled" so the value went from false to true.

When I open a new live game at chess.com, the drag and drop has worked once more.
I hoped this log help anyone.