How to install errorbarbar function (r2012a)?

Hello,

I've just downloaded the .zip folder attached thinking that it'll contain a file which, once activated, would incorporate the errorbarbar function into MATLAB for me to use it as any other function. I know how to plot a bar graph using errorbarbar, done that before on another PC - but the way I've been shown how to do it doesn't require such a lengthy piece of code. Maybe I'm missing something, but is there a way I can activate the errorbarbar function in MATLAB (and then use it to plot my graph the way I know how to do it, i.e. not using the code above)? Or the code above has nothing to do with plotting the bar graph per se - it's just a piece of code for the errorbarbar function itself, which has to be tailored in order to activate it?

Thank you in advance.

Bianca