Welding Woes: Please help me troubleshoot "or" help the dummy out

THE PROBLEM IS YOU NEED THINNER WIRE FOR THE MIG , Oops caps were locked ,Go up on guage of metal and turn down reg to 12 ....You really need smaller guage wire and tips for sheetmetal ,Its a shame that 30 and 35 are common......I think they make a guage wire in the 20's but you can only buy it either fluxcore or solid ,I forget....Think its 23 wire.....