Welcome; TD is a great tool, however I do not know it for the iPhone. The unique ID that I am aware of is accessed from Acount Settings which is on the blue left side of screen navigation bar. The Edit function for this generates a new one that you do not control. I expect that the long string is fairly complex for security reasons.
If this is NOT accurate I am sure someone else will correct me.
P.S. The "Questions" sub-forum is much more active and ?s like yours are often asked there. However I understand that you and anyone might think that "Tips and Tricks" would be the place to do it as one might hope there is a "Trick" to it.
Yes, I believe Edward is correct. There is no way I am aware of to choose a custom unique ID. You can change it, but you will just be assigned another randomly generated ID. Also, the Questions forum is a better place to post questions like this. I try to keep up with all the posts in every forum, and Toodledo does as well, but sometimes it gets very busy, and things in forums like Tips & Tricks or Off-Topic Chit Chat might get overlooked.
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