We have a lot of Running Clubs moving to RunSignUp. A common challenge of the transition is matching a person on an Excel spreadsheet to a real user logging in.
We offer a “Claim Account” capability. This allows a member that was uploaded with an email address a method of claiming their account.
One of the best ways to access this is to post a list of members on your Club page (you can chose to hide this, but this can also solve a lot of common questions. You can see what the list looks like and how a “Claim Membership” appears by some members who were imported.
Here is a video explaining how accounts are claimed: