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Let us help you by getting the details you need on this Samsung washing machine model.
You should add bleach to the dedicated “Bleach” compartment (usually marked with a symbol or labeled “Bleach”) in the washer’s dispenser drawer.
According to the manual, bleach is dispensed automatically during the bleach phase of the wash cycle, typically after the wash begins and the tub has filled with water but before the main wash.
For a visual guide showing exactly which compartment to use and when bleach is added, please see pages 30 and 32 of the user manual below:
https://downloadcenter.samsung.com/content/UM/202407/20240725163316712/DC68-04355B-04_IB_WF8300B-MD_EN.pdf
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Leo