I think this should work to import GEDCOM files:
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Go to the account you want to export the tree to.
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Go to 'My Account', and click on 'Create or import new family'.
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Click on 'Import GEDCOM or FamilyScript'.
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Click 'Browse' and locate the tree's GEDCOM file.
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Click 'Import', and then 'Finish Import'.
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Save the tree on the account (use the normal 'Save' button).
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You should then be able to use the tree as normal.
Hope this helps!