Start by visiting Skyworth's website and the support page.
https/www.skyworth.in/index.html
I looked/googled about for a User Manual/Guide and did not note any applicable guides.
The one site that "seemed" to have the guide wanted a credit card number to prove you are a real person and not a "bot".
Do not do that. And overall avoid any websites that want personal information for a manual that should be freely available.
Work with Skyworth - hopefully their support team will be able to help.