If you are just getting started with the ESP-13 Wifi Shield from Jaycar, I would encourage you to have a look at my "getting started with the ESP-13 WiFi shield" tutorial. It explains in great detail how to configure your Arduino, the IDE and the WiFi shield, and is a good pre-cursor for any of my ESP-13 WiFi shield tutorials (including this one).
This tutorial will show you how to setup a simple webserver on your ESP-13 WiFi Shield and display a table of all of the WiFi Access Points within it's range (and refreshed every 5 seconds).
The ESP-13 shield will create it's own WiFi access point, which means that you can take this project anywhere you want to. You do not have to be connected to your home/work WiFi network to see the webpage. The limitation however, is that your device must be within WiFi range of the ESP-13 WiFi shield in order to see the results of the WiFi scan.
Let me show you how to put this project together: