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Modify the text as required in the form and then select File, Save Document to save any changes made. (Remember, a single text message is restricted to 160 characters (and that includes the practice name) – you can have multiple if required)
Note that there are three date options - 303 Date (Long), 324 Date (Mid) and 323 Date (Short). If you are finding your messages are chopped off, try using the short date option.