Just remove the Wifi password.
Do not have a kids profile. It cripples it and only works with Amazon bought books, yet my grandchildren have about 1000 to 2000 public domain ebooks, plus a few dozen bought from online other than Amazon.
We bought two of our kids a Kindle PW3, one grandchild a PW3, but 3 others now have Kobos (Original H2O, Nia and Sage). Youngest ereader user has a dedicated colour LCD Binatone ereader. She'll get a Kobo in a couple of years.
The Amazon Kids Fire, Kids Kindle and Kid's profile are all marketing gimmicks locked to Amazon content. Avoid them.
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