"Ad new" button missing in "themplates"

Hi!

I have downloaded a themplate and want to install it. I used the youtube-guide and it said there should be a “ad new” button in the “apparence”-“themes”..but there isn’t anything like it.
Please help!

[closed – continue at https://wordpress.org/support/topic/ad-new-button-missing-in-themes?replies=3 ]