HOW TO SET TRAILING STOP

I need to set trailing stop , assume I have open order in price x and stoploss is price y ,when market are in profit in price Z I want stoploss in price y move in open price x means break even, here its my working, thanks.

This is how you can move SL to breakeven at 50 pips for example. Does that help? Let me know

Thanks for your feed back. But I try to do the same as you shown above, but when I attach to a chart this expert advisor failed to load into a chart, can you look, why it failed to load into a chart ?