Need help on adding custom footprints into GSA

Hello,

I have collected some blog commenting footprints, how to add these footprints into my GSA? do any one know?

On the edit project screen you can enter as many keywords as you like separated by commas. GSA will search for those when looking for new targets. I think it inserts its own footprints when looking for specific engines you select on the left, along with the keywords you enter into that field.