All in SEO – How to used

Dear friend
I did add plugin for my site : https://vietnam-cambodiatravel.com
But I can not change title,description,keyword for Categories .
https://vietnam-cambodiatravel.com/tours/vietnam-tours/
https://vietnam-cambodiatravel.com/tours/vietnam-tours/
https://vietnam-cambodiatravel.com/tours/cambodia-tours/
https://vietnam-cambodiatravel.com/tour/

Please help me.
Thanks