Hi Karen.
Thank you for reaching out regarding your Samsung - 30" Built-In Double Wall Oven with WiFi on what the WIFI feature do and how to use it. Regarding your concern, once the Smart Control is on you can do the following:
•Remotely change oven settings (mode, time, temperature) using your mobile
device.
• Remotely start the oven.
• Remotely turn off the oven.
• Once cooking starts, you can change the cooking time and temperature remotely.
On how to use it here are the steps:
How to connect the oven
1. Download and open the SmartThings app on your smart device.
2. Follow the app’s on-screen instructions to connect your oven.
3. Once the process is complete, the connected icon located on your oven
displays and the app will confirm you are connected.
4. If the connection icon does not turn on, follow the instruction in the app to
reconnect.
To start the oven remotely
1. Touch Smart Control. appears in the display. The oven can now be started
and controlled remotely by a connected mobile device.
I suggesst you check this link to your user manual for further assistance. Please go to pages 26 to 27.
https://downloadcenter.samsung.com/content/UM/202002/20200210163459233/NV51R5511D_AA_DG68-01126A-02_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
Reference Ticket Number: 1144675066
Thank you for being a valued customer of Samsung. Have a great day.
^Camille