[Koha] How I can config the Memcached tab

[webmaster UVG Altiplano]

Hello everyone

I try to have the Server without error or warnings and I want to fix the
memcached tab.

Memcached: Servers: undefined | Namespace: undefined | Status: unknown |
Config read from: Nowhere Note that the right place to define the memcached
config is in your $KOHA_CONF file. Currently you do not have a valid
memcached configuration defined. | Effective caching method: Cache::Memory

How I can fix this warning or what are the default config?

Server: Debian 9.3
Koha version: 17.11.02.000

Thank you!