Wiring in a CTCSS or PL tone board into an older radio

[Kamakiri]

Here's my latest project, and I could use some advice as to how to proceed.

Recently bought this little number off ebay:

http://www.ebay.com/itm/CTCSS-encode...item2a89493dd2

These are the somewhat lousy instructions that came as a link:

http://isp51.blogspot.tw/2016/02/pro...led-ctcss.html

The radio I'm hooking this up to is a Clegg FM-28 2 meter radio. I have the manual that I can email if anyone needs it to help me answer this question.....

Generally, how do these CTCSS boards hook up? The PTT goes to the mic keying....that I get, but where do the tone wires go? As much searching as I did, everything seems to be a vague reference......