To plot a random source in GNU Radio Companion, users need to ensure they are correctly configuring the random source block to output bytes. The discussion emphasizes the importance of connecting the random source to an appropriate sink for visualization. If assistance is not provided in the forum, users are encouraged to consult the official GNU Radio documentation or utilize the community email list for further guidance. Engaging with the community can enhance understanding and troubleshooting of GNU Radio functionalities. Properly utilizing resources can lead to successful plotting of data in GNU Radio Companion.