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Something that's certainly necessary is something you can't live without. It's indispensable. And it's required by you to keep on living.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
デフォルトでは、名前と生年月日、メールアドレスの入力が必須になっています。
By default, you’re required to input your name, birthdate, and email address.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up whatever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.