Where's the entrance

I have trades open and running in Forex. I didn’t put any stops or limits on them at that time. Now I want to put stops and limits on them. How do I do this?

Assuming you mean to close the position in either case then simply enter a new order, either Sell To Close or Buy to Close depending on your direction, a limit order is at that price or better (ie to take profit), a stop order is to trade at that price or worse (ie a stop loss). The fact that they are ‘to close’ orders means it effectively links itself to the open position of the the appropriate instrument so that once either order is triggered, the other order will be cancelled automatically.