I can't login to website because I used a beta app

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So I've been using the Acela app to log into 3Speak on my iPhone. I have issues with it as it uploads a video but I can't do anything with the uploaded video.

This isn't a problem. What is a problem though is that I created my 3Speak account using that app but I can't seem to log into the 3Speak webpage. It keeps asking for an e-mail address but I'm not sure what address that is. I'm pretty sure it's the same one that I used for Ecency and d.buzz but it doesn't accept it.

Any ideas how I can find that information?

I can't login to website because I used a beta app | Ecency