Most of our KickStarter backers who have responded to the reward surveys will have had their Last Epoch accounts updated automatically. This update will have linked the relevant KickStarter information so that they have access to the appropriate digital downloads, forum supporter badges, and so on.
If your Last Epoch account hasn't been linked correctly, please create a ticket and we can do it manually for you. Make sure to provide your backer number and the email address you used for KickStarter.