Hi Detergent.
Thank you for reaching out regarding your Samsung - 6.0 cu. ft. Total Capacity Smart Dial Washer with FlexWash™ and SuperSpeed Wash on how to add the detergent. Regarding your concern, there would be the steps.
To apply cleaning agents to the upper washer:
1. Open the top door, and then the protective cover.
Remove the Aqua Pebble from the fabric softener
container.
2. Put a recommended amount of liquid or powdered
detergent into the provided Aqua Pebble. The Aqua
Pebble has a guideline (marked ‘20 ml’) near its top,
which is the max line. Do not exceed the max line.
3. Insert the Aqua Pebble around the center of the tub,
and then put the laundry over the Aqua Pebble.
4. Add a recommended amount of fabric softener to
the softener compartment. Do not exceed the max
line.
5. Add a recommended amount of non-chlorine bleach
to the bleach compartment. Use caution not to
overfill the compartment.
6. Close the protective cover, and then the top door.
I suggest if you wish to use a pedestal you may want to get our front load washer and dryer. Please do check this link
To apply cleaning agents to the lower washer
1. Open the top-front cover.
2. Add a recommended amount of liquid or powdered
detergent to the detergent compartment. Do not
exceed the max line.
3. Add a recommended amount of fabric softener to the
softener compartment. Do not exceed the max line.
4. If you want to add bleach, add a recommended
amount of chlorine bleach to the bleach
compartment. Do not exceed the max line.
5. Close the top-front cover.
I also have included your user manual for assistance. Please go to pages 36 to 40
https://downloadcenter.samsung.com/content/UM/202109/20210906153018685/FLEX_WV9900A-MD_SImpleUX_DC68-04316A-01_EN_CFR_MES.pdf
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Thank you for being a valued customer of Samsung. Have a great day.
Reference Ticket Number: 1144217773
^Camille