really thanks for your feedback.
The registration process requires activation of the account by following the activation link from your mailbox.
I agree if you don't read your mail from kindle then a PC is needed to finish activation.
Good news is, that you don't need to copy/paste/type on your kindle - the activation can be done completely off-kindle on your PC.
However due to the limitation of the kindle's browser not allowing to open new windows some users might have difficulties to open the activation link on their kindles. I agree this is annoying and there must be done something!
Therefore we will ease the activation process for users activating the account directly from their kindles.
Until then the proposed and working workaround is to finish the activation process from a PC.
Thanks for understanding