Comment on the Idea with the most Votes, or that has been around the longest with the other duplicate Idea. For example:


This Idea https://blackbaudk12.ideas.aha.io/ideas/K12OB-I-407 has more Votes than this Idea https://blackbaudk12.ideas.aha.io/ideas/K12OB-I-279 So you would comment in https://blackbaudk12.ideas.aha.io/ideas/K12OB-I-279 "This is a duplicate Idea please Merge into https://blackbaudk12.ideas.aha.io/ideas/K12OB-I-407" This keeps 407 as the Higher Idea.