From neutral, push down the front of the lever to go 1,2,3,4,5. There is the optional 4 speed rotary shift in which it goes N,1,2,3,4,N,1,2,3,4,N etc., controlled by the short lever on the left side of the engine. If it stops after the 1 st shift, rotate the output sprocket (rocking the bike back and forth) a little or use the kickstarter to turn the engine. Sometimes the gear dogs need aligned to allow a shift. If this doesn't help, you may have a more serious problem. There are downloadable owners manuals and service manuals on this site.