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I think I found you on the Steam Community: https://steamcommunity.com/profiles/76561198930554806
If that's you, you haven't registered a username yet, so you need to use the number at the end as your ID on Exophase, so: 76561198930554806
You can still register a Steam username if you want, read the guide for more info, specifically the part about the Steam Custom URL.
I hope that helps.