Above mentioned campaign participants need to fill the respective joining form of those campaign, which you used to register yourself in those campaign. Go to the form and EDIT it, And JUST UPDATE YOUR XT Exchange mail address.
Please go this google form and submit your XT exchange mail address.
Google form for Bitcoitnalk and Bitcoingarden Forum participants:
https://forms.gle/r7iESMHDuy6bnoQZ9Google form for Altcointalk Forum participants:
https://forms.gle/KSawsw1AVs3RZywSA