I think you are new in Salesforce so don't worry. First thing is that Salesforce doesn't provide the Oubound Messages. I suggest you that you can integrate an app of AppExchange (App Store of Salesforce) like - "360 SMS App for Salesforce". You can just install it in your Salesforce Org from the given link - https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3000000DpSyIEAV
https://www.twilio.com/learn/contact-center/supercharge-salesforce-with-twilio
https://automate.io/integration/salesforce/twilio
https://twilio-salesforce.readthedocs.io/en/latest/
https://github.com/twilio/twilio-salesforce
https://developer.salesforce.com/forums/?id=906F0000000Am1zIAC
All Answers
their is no direct way to send the sms you can refer this link
https://success.salesforce.com/answers?id=9063A000000l20gQAA
https://www.twilio.com/learn/contact-center/supercharge-salesforce-with-twilio
https://automate.io/integration/salesforce/twilio
https://twilio-salesforce.readthedocs.io/en/latest/
https://github.com/twilio/twilio-salesforce
https://developer.salesforce.com/forums/?id=906F0000000Am1zIAC
I think you are new in Salesforce so don't worry. First thing is that Salesforce doesn't provide the Oubound Messages.
I suggest you that you can integrate an app of AppExchange (App Store of Salesforce) like - "360 SMS App for Salesforce".
You can just install it in your Salesforce Org from the given link -
https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3000000DpSyIEAV
And configure with that using below link -
https://drive.google.com/file/d/1a1WFE1UhKPxw2IEeKIQ2CdC11ynWDmec/view
Please select as a best answer if you understand using my given answer.