In the Admin section, click on the Cards tab

Under the Owner column, click the filter icon in the top right and search for the owner you want to replace:

Next, hit the SELECT ALL button in the top left to select all of that owner's cards:

Lastly, hit the Edit drop down in the top right and choose "Change Card Owner"

Select your new card owner for those cards and you're done.

Let me know if you need anything else.

Sincerely,

ValiantSpur

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