Hi seabass.
Thank you for reaching out regarding your Samsung - 30" Single Wall Oven with Steam Cook and WiFi - Stainless steel on how to use the steam function. Regarding your concern, I recommend you check these steps.
1. Open the oven door, and then touch Reservoir.
2. The oven ejects the reservoir. Grasp the front of the reservoir, and then pull it
all the way out of the slot.
3. Fill the water reservoir with 22 oz (650ml) of water.
NOTE
You can open the reservoir by removing the rubber cap or by removing the clear
plastic top.
4. Replace the rubber cap or clear plastic top.
5. Return the reservoir to the slot, and then push it in. There will be a soft click
when it is in place correctly. Touch Reservoir. The oven retracts the water
reservoir.
6. Close the oven door.
7. Touch Steam Bake or Steam Roast.
8. Touch Steam Level once for Med, twice for Hi, or 3 times for Lo. (Default is Lo.)
The display will show the steam level.
9. Enter the temperature you want, eg.400 °F, using the number pad.
10. Touch START/SET.
The temperature display will start to change once the oven temperature
reaches 175 °F. The oven will beep 6 times when the oven reaches the set
oven temperature.
11. If you want to cancel steam baking or steam roasting or if you have finished,
touch OVEN OFF.
I also recommend checking your user manual for assistance. Please go to page 29.
https://downloadcenter.samsung.com/content/UM/201904/20190417152823461/NV51K6650S_DG68-00855A-03_EN-MES-CFR.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: 1144214942
^Camille