Can I join a minecraft realm?

I'm guessing youre on a PC version. I do believe there's a website for the mc realms. Try looking at the websites. But be careful on what youre giving out on the internet. Never use your actual accounts for the time being (a great example for this a dummy account on skype and steam)

But I can also recommend people that I know that you'd love to be with from time to time (either in youtube or in twitter or in their stream/ twitch.tv)

MC players:

MKtheWorst (girl)
Sigils(girl's husband)
GirlsGonnaGamesBro (also a girl, I think that's how she's called on twitter)
TheCleverCreeper
TerasHD
ADuelGet
Nowayitstrevor

you could learn a lot from them. Both in game of minecraft or otherwise. And they're open to people.

back to the topic: just check the minecraft realms on the internet i'm sure there's a website for these where they give our their IP address for the realm.

Enjoy and play safe.

Do you mean only minecraft or minecraft pocket edition?