If you forget the qunoot in witr, you can continue your prayer without doing it. Kindly refer to the following link(s): Is qunoot mandatory in witr? https://www.youtube.com/watch?v=C-Im5zQVnQQ

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What you had missed, what you prayed after it takes its place. This means you have to stand up and pray one more rakah and offer sujood assahu after Salam.

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He must take all necessary means of finding the qibla such as asking others for direction, contacting the Islamic center, using a compass or using a mobile app for finding it. If you were still unable, you should pray facing the direction which you think is most likely to be the direction of the qiblah

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