Thanks for posting in the Apple Support Communities Karenrenee10,
We understand you're encountering issues while steaming video.
If you haven't yet, try restarting your iPhone normally as advised here: Restart your iPhone
Should the behavior persist, try from a different Wi-Fi network, over cellular data, or connect to Wi-Fi and try if you've only attempted on cellular data, to see if there's any change.
If you need more help, providing additional information, such as what the error you're seeing says or any other details you believe might be pertinent, can increase your chances of getting specifically relevant and helpful responses from the community.
Cheers!