You are a joy to help. I love your screenshots.
Yes, right click on that then click on Install then Apply, then another apply.
Wait, depends on how fast is your download speed, and if its already installed just look for it at the menu under Internet.
I would also suggest for you to Search and Install via Synaptic all other linux software that you may be of interest in the future.
If it is not in Synaptic, then you can actually request it.