wire the 433Mhz module like shown

Install OctoPrint like normal to your SD Card

https://octopi.octoprint.org/

configure WIFI using the octopi-network.txt file or plug in a LAN cable

Login to your Pi using pi/raspberry

do update everything and install git-core

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install git-core

install wiringPi and Raspberry-Remote

cd
git clone git://git.drogon.net/wiringPi
cd wiringPi
./build
cd
git clone git://github.com/xkonni/raspberry-remote.git
cd raspberry-remote
make send
cd

Test if you can Power Up and Down your Plug

the first 5 Digits are the System Code for the plug
(hex Code Pin Up = 1, Pin Down =0)

the letters are plug A-D
(A=1 / B=2 / C=3 / D=4)

sudo ./send (Systemcode)(plug A-D)(1 On, 0 Off)

in the Picture it would be like

all numbers up except 5 which is down = 0
and A up = 1

cd /home/pi/raspberry-remote

#power on plug A
sudo ./send 11110 1 1

#power off plug A
sudo ./send 11110 1 0
</

sudo nano /home/pi/.octoprint/config.yaml

replace the following in this file

system:  
actions: []

with the following code

system:
  actions:
    - name: Shutdown 3D Printer
      action: shutdown 3D printer
      command: sudo /home/pi/raspberry-remote/send 11110 1 0
      confirm: You are about to shutdown the 3D Printer.
    - name: Power On 3D Printer
      action: power on 3D printer
      command: sudo /home/pi/raspberry-remote/send 11110 1 1
      confirm: You are about to power on the 3D Printer.

restart OctoPrint Server with the following command

sudo service octoprint restart

then you should see the new commands in the drop down menu

and of Course they should do what they are ment too :)