This link is broken, either the page no longer exists or there is some other issue like a typo.
Has to be installed in the pipe if you do not already have one.
If you don't have one, your strong draft may be causing the fire to burn too quick or suck the heat up the chimney.
It is a semi-handyperson type of install. Pictures will help us help you.
If you are time constrained, toss some coal on the fire before shakedown, open the air one full turn, chase the kids, return in 15 minutes, shake down, add more coal, chase the kids for 15 more minutes, turn the air back to the original setting and relax.
Kitchen Timer is handy to remind you to return to the stove in 15 minutes.