Volume Meter on the iPad app?

I've been trying to find it for a few days and so far, I don't see it anywhere. Today I figured I would try to login via Chrome and access the web version of Classcraft rather than the app, but I'm getting a message that Chrome, Firefox and Explorer are supported browsers?  I checked to be sure I wasn't using Safari, and I'm not. 

So is the volume meter not able to be used with an iPad? 

Thanks for an assistance