For installing the font there are 2 ways in which this can be accomplished. The first is a simple one. Just copy the font to the Font Directory located at C:\Windows\Fonts which will install it for the system to use. The other method is to click on the font file at its current location. It will then give you a screen that shows the font preview and there you will see the button to install the font right at the top of the screen toward the left side.
Finally check out example.rptdesign. There's a label with bar code. Take a look at barcode.png, i've marked in red, where you can change font of the label.