I want to make my PC to have wireless WiFi

[jonezeen]

I would like to make my PC connect to the internet wirelessly.
I have the Acer Aspire AX1800-E1502
http://snlookup.com/acer-aspire-x1800-desktop-pt-sbw02-033-p72158#ffs-tabbed-13

I also took a picture of a slot on the motherboard. Is it a PCI-Express slot? https://imgur.com/a/6etf7

If my PC can support wireless networking, what are some good parts to buy?

EDIT: I will be using the PC mainly for streaming Netflix, Youtube and streaming videos.

 

[SoggyTissue]

you can buy a usb wifi dongle and keep your insides clear of clutter (better airflow).

http://www.ebay.co.uk/gds/The-Dos-and-Donts-of-Buying-USB-Wi-Fi-Adapters-Dongles-/10000000177330086/g.html