How can I change my email address on one of my devices?

I have 2 Dropbox accounts

I have 2 devices (Android and a Windows PC linked to 1 account
I have another Windows PC that is linked to my other account and I need to change the Dropbox login credentials so that it has access to the same files and folders as the first 2 devices

I still have my original question:
"How can I change my email address on one of my devices?
I need to change the Dropbox email address on one device"

Martin D.22 wrote:

I do not see a security tab in the Dropbox browser interface

https://www.dropbox.com/account/general :

And if all else fails just unlink, uninstall, shut down and reboot and reinstall via http://www.dropbox.com/downloading 

That was helpful

Your advice brought me to a web interface that would let me edit the email address

But it throws an error message when I edit/change to the email address I want to use

Martin D.22 wrote:

"How can I change my email address on one of my devices?
I need to change the Dropbox email address on one device"

You arent changing email. You are changing account.

You need to log out of the account already installed and add the new one. 

Martin D.22 wrote:

I believe that Dropbox should modify the sign in to allow the user to supply any credentials (email and password) they want to use for that session

All you have to do is sign out of the Dropbox website, then you can use any credentials you want in the app. The app and the website are connected.