So I got to advance in the problem but I keep having one trouble when sending the email:
This example works perfect:
CloudDeploy[FormFunction[{"Enter one character and hit ENTER" -> "String"}, SendMail["testtest@wolfram.com", {"First Phrase"}]&],Permissions = "Public"]
CloudDeploy[FormFunction[{"Enter one character and hit ENTER" -> "String"}, SendMail["testtest@wolfram.com", {"First Phrase"}]&],Permissions = "Public"]
But if I introduce a Second Phrase, it does not work:
CloudDeploy[FormFunction[{"Enter one character and hit ENTER" -> "String"}, SendMail["testtest@wolfram.com", {"First Phrase","Second Phrase"}]&],Permissions = "Public"]
CloudDeploy[FormFunction[{"Enter one character and hit ENTER" -> "String"}, SendMail["testtest@wolfram.com", {"First Phrase","Second Phrase"}]&],Permissions = "Public"]