A high probability orderblock (OB) needs a liquidity sweep to happen first. Once that's done, you mark the OB by highlighting the specific candle that took out that liquidity. Just like with an FVG, you expect price to return to this candle, tap it, and then keep going in its original direction.

For a bullish OB: You mark the last bearish candle that swept the liquidity.

For a bearish OB: You mark the last bullish candle that swept the liquidity.

The setup is ready once price closes above or below that OB candle. Then you just wait for price to trade back into it.

Also, you can treat most candles as OBs if the orderflow is on your side—just make sure there was a liquidity sweep on some timeframe and a solid candle closure beyond the one that caused the sweep.

Here are a couple examples of Orderblocks.

Bullish OB:

image.png

Bearish OB:

image.png