To see your Unmapped card, click the nav item in the left-side navigation. From there you can add an Unmapped Card.

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Adding from the Roadmap

You can also add an Unmapped card directly into a column on the Roadmap View.

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Adding to the Tree

Add an Unmapped card to the tree by navigating to Unmapped cards, clicking the “Add to Tree” button on the Unmapped card you’d like to move, and selecting the parent you’d like to place the Unmapped card under.