HORDE:
If you opened the portal in Honeydew Village, it can be found in the Portal Room in Orgrimmar.
ALLIANCE:
If you opened the portal in Paw’don Village, it can be found in the Portal Room in Stormwind.
If you are unable to use the portal, then you might need to have a Mage port you to the Shrine. Then you can fly back to where you were questing in Jade Forest.