Hello Kitty! If you want to activate or deactivate the child lock function, press the Kitchen Timer button for 3 seconds.
The display will show ON when the oven is locked, and
then re-displays the time. You may also find this information on page 10 of the user manual. I have provided the link below.
(https://downloadcenter.samsung.com/content/UM/201911/20191122104255594/ME4000R_ME19R7041FS_AA_EN-MES-CFR.pdf)

Thanks for choosing Samsung. ^Nic

Hi! If the video on the TV and audio from the Q65T Soundbar are not synchronized, press the SOUND CONTROL button on the soundbar remote, until you see AUDIO SYNC on the display. You can then set the audio delay between 0~300 milliseconds by using the Up/Down buttons. You can also try the below to minimize the delay: 1) Connect the source directly to the Soundbar’s HDMI input, then connect the Soundbar to the HDMI ARC input on the TV. 2) On the TV, set the Sound Delay level to 0. Home > Settings > Sound > Expert Settings > Digital Output Audio Delay: “0” 3) Change the audio format to PCM on both the source device and the TV. Please also make sure you are running the latest firmware update (ver1006.0 released 6/30/21) which includes improved connectivity. Should you need further assistance with this issue, or have any questions about features or operation, please contact Samsung Customer Support at 1-800-SAMSUNG (ask for Soundbars), available 8AM -12AM EST, 7 days a week, text HELP to 62913, LiveChat on Samsung.com, or Email: https://www.samsung.com/us/support/#contact_us_for_support ^Tim

Hi Serroco! The HW-Q850A Rear Speakers connect to the wireless module, which allows you to place these three units in the back of your room. One wire is required to connect each rear speaker to the wireless module. Then plug in the power cable to the module. The “wireless” convenience is in connecting your soundbar and any other speakers at the front of the room to the rear speakers – this can now be done via Wi-Fi through the wireless module, eliminating any clutter of long wires running the length of your room. ^Tim

Hello there! Is the steam involved in the cleaning process is a good question. During the self-cleaning process, the oven uses high temperatures (well above cooking temperatures) to burn off leftover grease and residue completely or reduce them to finely powdered ash that you can wipe away with a damp cloth. The process will cause some steam and we ask that you not open the oven door immediately due to the escaping hot air/and or steam that could burn you.

I have also provided the link to the user manual where you can find this information on page 42.
(https://downloadcenter.samsung.com/content/UM/202105/20210525183339900/NX60A6511SS_AA_DG68-01339A-02_EN-MES-CFR_210511.pdf)

Thank you for choosing Samsung. ^Nic