Hi, nedra66. My name is Straight Talk Shelly. I will try to help you now. Please find below the values needed to update your device data settings to be able to send MMS and connect to the Internet via your Browser:
Name: straight talk
MMS PROXY: 188.8.131.52
MMS PORT: 80
Select the APN you just created.
Delete the old APN from your phone if possible.
Once done, please try to send your own Straight Talk phone number a picture message. Let us know if it will work. Thank you.