Go to settings > Connectivity > Network Connections > and click "Create" on the bottom of the display.
Then you can enter the settings you were told.
A video for you if you're still confused
https://www.youtube.com/watch?v=AqXf4OgUnuU
Here are the settings I found over the internet. Take a look at it. But I am not sure the service provider is the same though. You better enter the things you've been told by your service provider
Settings : https://bestmvno.com/apn-settings/straight-talk-wireless-apn-settings/
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