how to Exit a position in Limit order??

Hello.. I have bought 500 nos in NIFTY CE.. after a reasonable profit while i placed a sell order, instead of selling the already bought item the "sell" window tries to place a new SELL order. Which means instead of squaring off my current position, it is trying to place a new order!!

Then by forcefully i have exited using market close order..

I dint find any video or tutorial about "exiting a position using limit order". 

So pl guide,

 1) how to place a LIMIT exit order for the ongoing position

2) whether the buy or sell button at the top left of the chart is only for creating a position not to square off? if it can be used to square off then how to use it?

if possible fyer can make a video of this tutorial and add in their youtube channel.

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