Add 1/4 to 1/2 of package of reactivated dry yeast to the bottling bucket before bottling. Then that yeast will eat the corn sugar I assume you will also be adding at bottling and will carbonate the bottles.
if you added the yeast to the carboys now, I don't think much will happen because the initial yeast most likely ate most of the sugar. If anything, you would get a small secondary fermentation, but it would not carbonate the beer.
Primary - A Little DAB will Do - Dortmunder Export
Secondary - London Calling Porter
Kegged - Lift Your Kilt to Wee Heavy, Dark Mild