Hello,
If your end goal is to reach RUT955 remotely, Remote Management System is one of the ways to go about your goal. You can check a couple of videos below on several access options:
However, RMS is not your only option.
You can try using ZeroTier VPN. It is attractive due to not requiring a public IP address, which you may not have. For configuration examples, please refer to this page.
If you have a public IP, you can go with other VPN protocols, as RUT955 supports a number of them.
Another option, although least recommended due to security concerns, is to enable Remote HTTP(S),SSH access. Keep in mind that for it to work, a public IP is also mandatory.
Best regards