All participants will have to create a Spacebib account to upload their online challenge/race results personally due to accountability and data integrity.

So you are not allowed to upload the results for someone else participation. Here's what you should do:

Ask the participant that you have helped sign up for the challenge to create a free Spacebib account using the same email address that you have entered during the registration.
Have the participant sign in to his/her Spacebib account.
He/She should see their participant in his Spacebib account under "My participation".
Log out and log in again to your Spacebib account if you did not see your participation record.
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