I forgot to add it when I was making the beer. It has been in primary for over 2 weeks and I can rack it to secondary if I can add in the Malto-Dextrin. What do you guys think?
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That's a good place to add it -- just make up a solution as if you were using priming sugar, and mix it in well. I have heard of some people even adding it at bottling, which in theory should be fine since it is unfermentable. I have never been that brave because I am never sure about the purity of it (i.e. if it has any fermentable sugars mixed in, it might overcarbonate your beer if added at bottling time).