I am working on an Arduino Uno R3 which i had bought from http://www.w11stop.com/ard-uino . I wanted to have the ability of controlling the Arduino wirelessly, like stopping the Arduino without having to pull the power-plug every time. Is it possible?
Glad you’re excited about microcontrollers and Arduino!
Here at SiFive we know the most about the HiFive1, which is similar to the Arduino UNO R3, but uses a different processor.
You will probably need a a shield accessory to enable your board for WiFi connectivity. There are lots of shield products that will make it possible to control Arduino (and the HiFive1) wirelessly. For example, this one would allow you to communicate with Bluetooth LE: https://www.adafruit.com/product/2633 on both an Arduino UNO and the HiFive1.
You can find more Arduino UNO R3 specific help at the Arduino forums.