You have to configure your remote access for your server. If you have already viewed your friends server from your house that means he has already done that
https://support.plex.tv/articles/200289506-remote-access/
If you have trouble look over these guides
https://support.plex.tv/articles/200931138-troubleshooting-remote-access/
When it comes to remote access, there’s a lot of different factors which can impact your setup. Some are under your own control, others not so much.
First off… there’s a dedicated support article on troubleshooting your remote access . I strongly recommend you have a look at that.
Find below some additional remarks on how to troubleshoot your remote access setup.
Review your internet access / remote access configuration
It’s good practice to review if Plex gets the correct public IP address…
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