Darkassassin and echo nailed it. Gotta go to off and then back on. If it won't go to off, time for an electrician. Tbh, it isn't that hard to replace a breaker, it's just risky even if you know what you're doing. Since not knowing what you're asking about is fairly reliable as an indicator you haven't got a background with electricity and wiring, don't fuck around. I do know a little from being poor and having no choice but to take risks, and I wouldn't do it myself as long as I could afford a pro. It just isn't worth fucking with as an amateur