Hi @jgallagher ,
Yes, if you don't have a file named hostnames by default, then you will have to create a new text file named hostnames. To create a new text file goto your sd card, right click and select New and then select Text document. Then change the name of the text document to hostnames without any .txt extension. It will ask you to confirm, click yes. Then open the hostnames file and add the desired name in it as shown in the video.
Please let us know if this helps,