Quick answer
Official control note—hold B for emotes—plus an explicit unknown state for all other keyboard, controller, and mobile inputs.
Start here when this is the exact player task you searched for. The sections below turn the question into steps, checks, and next pages.
For hus from clark controls, use the quick answer first, then check whether the topic affects a code reward, event, item, unit, map, build, value, or upgrade path.
B emote input and troubleshooting are documented without inventing platform-specific bindings: other keyboard, controller, and mobile inputs remain unknown.