I have a Kenwood TM-261, and haven't used it for maybe three years. Now, I'm hoping to get it back in service. The manual is confusing. How do you set DTSS in this radio? The manual says Press (F), (1's). Pressing F is fine. But, where do I find (1's) ??? Our repeater where I live has PL 167.9. I hope this gets me into this repeater.