How to enable memcached

[fluxive]

-- moved to Configuring & using PrestaShop forum, sorry --

Hi,

I'm trying to enable memcached under Back Office > Preferences > Performance

I had my host install memcached, and now I don't have the warning that memcached isn't installed anymore

Right now under the settings I have: "Use Cache=Yes", "Caching system=memcached"

I don't have any server added, do I have to add a server for it to work?
If the server is local, do I need to put 127.0.0.1 in the IP address? or maybe localhost?

Thanks in advance