Merging two accounts is difficult on our end and isn't something we can do routinely, our engineering team only does it when absolutely necessary. Before requesting a merge, it's worth considering whether it's simpler to just choose one account to keep using going forward.
This most often comes up when someone can't log into an older account that has their climbing history and ascents, creates a new account in the meantime, and later wants to combine the two. If that's your situation, contact KAYA support first about regaining access to the original account, that's usually a faster path than a merge.
If you're set on merging, contact KAYA support with both usernames, both email addresses, and which account you'd like to keep. The team will look into what's possible, but a full merge isn't guaranteed, and it may take some back and forth to sort out.
One thing to know going in: if you've started a new account and want the username from your old one, we can't simply move that username over to the new account. Keeping the original account is usually the better path if the username matters to you.