I can't connect to my account on Minecraft.net

When I want to connect to my account on Minecraft.net (because I want to change my skin), it show to me the correct page (background) but not with the login interface (e-mail, password, ...)

 

How can I change my skin Minecraft Java Edition (windows 10) ?

 

Thanks you for reading this message (and sorry if my english is (very) bad)