Can't Turn in Quest - Into the Wilds

The quest Into the Wilds is a breadcrumb quest to get your character started in Krasarang Wilds in Pandaria. If you have already completed the follow-up quests in the zone, your character will not be able to turn in this quest, which is intentional.

You can safely abandon this quest if the questgiver will not accept it, because it means you have completed the follow-up quest. For the full questchain, check under Series on this Wowhead page.

The quest will still be offered, even after you have completed the follow up quests, but you can safely ignore it.