Come someone help me, what should i add on this code blocks so that it has auto response (to an sms message )

A guess. Perhaps instead of SendMessage use SendMessageDirect.
Welcome.

You have to use Companion version 2.68u instead of 2.68 to expose the direct block on your pallet.
https://ai2-appinventor-mit-edu.ezproxy.canberra.edu.au/reference/components/social.html#Texting.SendMessageDirect

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so i'm just gonna replace the sendmessage to sendmessage direct?

yes and you should set message to anything (text, textbox text, random text and...)

this discussion might help

can you be more specific