FTP?

[Thatoo]

Is it possible to connect to the PluXML folder by FTP?
Which user?
Yunohost's admin can't make modification...
How to change PluXML's template for example?
How to upload a folder to /var/www/pluxml/themes ?

[Thatoo]

I tried to do upload folders to /home/admin by FTP and then to mv /var/www/pluxml/themes/ and then chown pluxml:pluxml -R them but it didn't work, they don't appear in admin panel of PluXml...
What should I do?