heretohelp

Assuming you are already logged in to the app, you should never have to input your amazon credentials in order to link a skill. Whenever you are trying to link a skill to your account, it is most likely asking for credentials that pertain to that particular skill. I took a look at Jinvoo Smart Home and their linking page is very misleading (lacks a sign up, or really any info...), but it looks like you need to get the Jinvoo Smart app separately, create an account, and then use those newly created credentials (in this case, number/pw) on the skill linking page.