Enter
The kanji and the radical are the same, so remembering the meaning of this kanji is as simple as making sure you know the radical for enter first! If you know the radical, you know this kanji means enter as well.
にゅう
はい, い
None
Turns out, after you enter the tent (remember how the person in the radical is entering one?), you're given a new (にゅう) one! Why? No idea, but hey — it's new!
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever 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.