Oh, yo ahora entiendo. "Cambia el tema" y "es un noob" no son imperativos, es cómo...
I said those in asterisks because they are actions I am doing. You know like when people are like *kills you* or something? Hago eso en Español. xD So, when I said *es un noob* I was saying *is a noob*, as in the action I'm doing right now is being a noob. xD Sorry about that.