https://help.tallysolutions.com/docs/te9rel60/SMS/Enable_SMS.htm

Enabling SMS Feature in Tally.ERP 9

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.