Well, that can be very easy... or very hard.
The world is changing IP Address formatting from IPv4 to IPv6. MC does not work with IPv6 at all at the moment, to the best of my knowledge.
The very easiest.As per the Wiki Jim posted, just enter the URL
https://jriver.com/panel.html into a browser on your work PC. You will need to know your JRiver MC Server Access Key to connect to your home MC Server from outside your network.
So, simple:If you know the external IP Address of your network, let's say it is 150.148.233.96, then you could also just enter this URL into a browser on your work PC.
150.148.233.96:52199
You can look in your router interface for your external IP Address, or visit
https://whatismyipaddress.com/ or similar sites. For example,
https://www.whatsmyip.org/ will show you your Hostname, which often has your IP Address embedded in it.
You can even look up what JRiver knows about your IP Addresses using the URL:
http://webplay.jriver.com/libraryserver/lookup?id={Your Access Key here without brackets}
Both above methods work fine from my Android phone connected to the mobile network using mobile data, so from a point external to my home network. They don't work from a PC at home though, so don't try testing this from home. I suspect my ISP is blocking packets that originate from my home network and then want to be sent back to the external IP Address of my home network, or something like that. It may be my router rather than my ISP. Anyway, that sort of addressing should work from your work PC to your MC Server at home... as long as your IT people allow those sorts of connections.
A little bit harder:Typically your external IP Address will not stay the same all the time. ISP change them as they wish. The Access Key method above gets around that issue as MC updates the IP Addresses associated with the Access Key regularly. As long as an IPv4 address is visible to the external world.
Another solution, if you didn't want to use the Access Key method, is to ask your ISP for a Static external IP Address. Some will do that for you. Some will not. Sometimes if you explain that you have a server you need to access from outside your home, they will do it. Sometimes they will want to charge you for the service.
Yet another solution is to use a Dynamic DNS service, which will provide you with a Domain Name for your home. i.e. Zonka.dyndns.org The DynDNS service used to be free, but now costs $25 a year. There are probably still free services out there, but you are in luck, as TP-Link provides a service. It may also be free. You will have to check. See page 73 of your User Manual. Let's assume that you used the TP-Link Dynamic DNS service, and got the Domain Name zonka.tp-link.org, then you would just enter this URL into a browser on your work PC.
zonka.tp-link.org:52199
Much harderSome ISPs don't actually issue IPv4 addresses to customers any more. They put customers behind a Carrier Grade Network Address Translation (NAT) router.
The good news is that with those ISPs you can typically ask for a Static external IP Address, as above. If they won't do that you are pretty much stuck I think. I don't think Dynamic DNS services work through a Carrier Grade NAT, but I haven't researched that. Your ISP should be able to advise though.
In my case, in Australia, I don't have a Static external IP Address, but my address doesn't change that often, and there is an external IPv4 address visible to the world. Hopefully, you are in a similar situation and the simple method above will work. At a minimum, if you note your external IP Address while at home you could use that to test if the simple URL above works from your work PC.