You can enable the SMS Feature in Tally.ERP 9 from TSS Features.
To enable the SMS feature
1. Go to Gateway of Tally > F11: Features > TSS Features.
Note: Set the option Use security control to Yes while creating or altering a company to enable TSS Features.
2. Enable the option Enable SMS access.
3. Enter a short name for the company in the field Company name for SMS. The company’s short name cannot exceed ten characters.
4. Press Enter to save.