i am an iphone 6s user , i know my apple id password but still , I cannot able to login my icloud account in a windows laptop. Please do something.... .

You may need to enable 2 Factor Authentication on your Apple ID and create an app specific password to use. If your account won’t allow 2 Factor Authentication, try 2 Step Verification.

Apple ID -Two-factor authentication     *     

 Two Factor Authentification availability.   *

 Apple ID - Using app-specific passwords.   *  

Apple ID - Two Step Verifications FAQ    *

Where can't you log into iCloud? What happens when you try? Error message(s)? More information would help.

it’s not letting me login my iCloud