mIRC is an IRC client, Freenode is an IRC server, there is not a single thing mIRC can do for you regarding the usage of the Freenode IRC server, that's like asking the Firefox's team to enhance your experience when browsing the mirc.com http server.
If you are concerned with sensitive informations such as your Ip address, then a cloak isn't going to change anything, your IP address is known to the server whenever you connect to it (the cloak being applied after), so either you want to use Tor to hide your IP, or you don't want to connect to freenode at all (or any IRC server anyway).
There is nothing mIRC or this forum can do, you need to find an helping channel on freenode and ask there.