Its easy. Open the code in mql editor, and add extern infront of martingale and multiplier near the top of the code.
Originally Posted by snail69
Just go down a few lines, you will see something like this
All you must do is add "extern" infront of the vartiable definition type, so that it looks like this:
bool martingale = false;
int multiplyer = 2;
Complie (button on the top bar), then click terminal, and it will be updated and sent to the MT4 terminal.
extern bool martingale = false;
extern int multiplyer = 2;