The conversation

You play Stonetop by talking to each other. The GM says something, you and the other players respond. You ask each other questions. You refer to the rules, roll some dice, and talk about what the results mean. You take turns talking, but it's not, like, taking turns. As with any conversation, you'll talk over each other, interrupt, offer suggestions, and so forth.

The goal of this conversation is to create the fiction, the shared imaginary reality in which the characters exist and act. The specifics of the fiction are often fuzzy, with each of you picturing things differently. But when the details start to matter, you'll talk it out, clarify the situation, and come to an agreement.

As a player, you are responsible for your player character (your PC). What they say and what they do. How they feel. Their background and their experiences prior to play. You speak in your PC's voice. You say what your PC does.