The price will be determined by the first order in the BIDs order book.
Example using Take Profit
You buy 1 ETH at $100 and set Take Profit of +5%, at $105.
After a while, ETH begins to rise and the following occurs in the trades:
Example using Stop Loss
You buy 1 ETH at $100 and set Stop Loss of -5%, at $95.
After a while, the ETH begins to fall and the following occurs in the trades: