You can post your unique local unicast address since they are pretty much the same as a IPv4 private address. It has the prefix fc /7 (fd /8).
However I don't suggest you to post your IPv6 public address, especially in a network expert forums. You can try to abstract your question by making reference to its components (Network Identifier or EUI - Extended Unique Identifier) or simply come up with a "fake" one which you can reference later to your actual one.
Take a look at this discussion. It is basically the same question.
Replying to the comments:
What the equivalent of Private (internal) network addressing is in IPv6.. [It] is called Unique Local Addresses (ULA). In the IPv4 world, private addresses include 10.0.0.0-10.255.255.255, and 172.16.0.0-172.31.255.255, and 192.168.0.0-192.168.255.255. In the Ipv6 world, the ULA space is fc00::/7, or basically anything that starts with FD in the IPv6 address, so fdxx:xxxx:xxxx…