I design picaxe circuits using realpcb and program using either logicator or Basic via picaxe programming editor, which is a free download from Picaxe.com. The problem with using the autorouting software in Yenka is that it misses out some tracks - notably the 0v connection to an 8 pin chip (or it may be the +v - can't remember) and the obligatory pull up/down resistor on the input pin. Also the autorouted circuits are very big. In logicator you have to selecet the pic type and, if it's an 08 or 08M you have to specify the number of inputs and outputs. I think you can output a Basic file from logicator and import it into Yenka, but I'm not sure if it will give you a flowchart. I find the forum on the picaxe website very helpful if I get stuck with programming.