Attributes in menu

Edit the attribute – there is an option https://dl.dropboxusercontent.com/s/25a7k8t3p9t38dx/2015-09-04%20at%2016.38.png?dl=0

Thanks but in which page is this? i cant find it.

Products > Attributes > Click on edit for one of them.

Thanks!, got it,

for anyone else trying the same thing, you need the above code and the checkbox.

one problem i have is that i cannot use greek characters for the function

https://www.domain.com/pa_greek_letters/something

it would be nice for my permalinks, any way i can do it?

if i change the attribute permalink it adds another level

https://www.domain.com/changed-attribute/attribute-name/something