there is probably a very easy solution to this problem, but I haven't found it after hours searching the web.
My wife and I recently bough a Kindle Paperwhite ´18 and registered it to my personal amazon account. We downloaded a book which we both want to read at our own pace. I have also added my wife as a "user" thinking this would solve my problem, but no..
So, how do we set up the Kindle with two users? My idea is that the individual users on the Kindle (which is registered to only one user and - in this case - my account / credit card) can be easily changed between. If I am using it, the progress in all the books I am reading is remembered. Same goes for my wife, when she uses her "user", her personal progress (in the same books as I am reading) is remembered. This way I don't have to remember which page I am on, and navigate back/forward in the book after my wife has used the Kindle..
If two people are reading the same book at the same time in different devices on the same account -- just turn OFF Whispersync. Then each device does not check the other to get to the most recent or last page automatically. If one person reads that book on a third device, they must sync manually (search for the farthest/most recent page).
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There is no such thing as a stupid question!
Corollary -- so long as you read before you post and stay on topic. :)
What you're seeking to do is impossible. The Kindle doesn't toggle between reader accounts in the way you want to do. Such reader accounts don't exist. You would be best to buy an additional Kindle. You could then follow Occasional Customer's suggestion.
Alternatively, register each Kindle to your own Amazon accounts and keep your libraries separate.
If I understand you correctly, you are trying to read the same book, on the same device, by two different people? I'm not sure what you mean by "I have also added my wife as a "user" thinking this would solve my problem" there is no way to sign two different users (accounts) into a Kindle. The device is tied to an Amazon account, and only that account. It sounds like you are hoping for 'profiles', I believe you can do that on a Fire tablet, but no Kindle can be used that way. You can both share the books on one account by have two different devices (one Kindle and one phone, or table, or a second Kindle) registered to the same account, and you can both have the same book, you would just turn off wispersync. I would say, keep an eye out for a lightning deal on a second Kindle.
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Thank you all for good answers, especially ReaderMartin and Jax! I realize now that the Kindle does not have "users" the way I thought it would. I wish Amazon/Kindle will make this a possibility in the future so several people can read books on the same Kindle, and have Kindle remember where they left off by choosing your profile/user.
A bookmark is a good alternative and I will definitely check it out as a work around!