I’m running Visual Studio 2012 Update 5 with Visual Micro for Arduino development. However when I open Visual Studio in the top left next to where it says Arduino 1.6.

What should I do?

The answer here is in the question. Basically an IDE (Integrated Development Environment) needs configuring. The easy way to to this is to select the dropdown menu where is says “Arduino 1.6” and select <Configuration Manager>.

This will bring up a menu:

microcontroller-ide

Have a look here and see where it takes you…
You can also download the Arduino Software from here: https://www.arduino.cc/en/Main/Software