You bleed the stove lines by opening a burner - or all of them. Are you getting spark? Did you try a match? Any propane at all flowing from the burner(s)?
If no gas from the burners, you can check for gas flow from the line that feeds the stove. Only do this if you are familiar with handling gas lines - get help if not. Turn the LP tank valve off. Remove the stove top and disconnect the gas line input, then open the tank valve slowly while somebody monitors the open gas line. Use a propane sniffer device to see if gas is flowing. And make sure there are no sparks or flames near by!
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL