Can't access my Realm

I was playing on my Realm and I got off for a second. When I tried to get back on I could not. When I clicked Realms from the main menu all it did was take me to the little Realm advertisement page "Realms is a safe, simple way to enjoy an online..." etc. From there I can only press the back button to return to the main menu or press "Buy a Realm!" and it takes me to the Realms website. I have purchased a Realm and it still has around 16 days left. I've opened and closed Minecraft a few times and restarted my computer and the problem persists. I don't know what to do.