How to add cache?

[frasten]

Bug report from Magonzalez987

hello frasten

i like your plugin

http://wordpress.org/extend/plugins/wordpresscom-popular-posts/faq/

i want the plugin placed on an old site with no widgets so this is the code i used:

best post:&number=5&days=0&format=%post_title%&cachename=cachelist1" );?>

so theres a parameter i dont understand and i think its wrong or not explained well

its

cache_only_when_visitor

how do i add that on the code?

and what does it does, cause on default, i think that parameter means

only show a cached version to non registered users?

which is the setting i see on the widgets version, and i see that by default is not checked.

im a little confused here.

i actually want a cache file, and serve that cache to everyone except the logged users, so visitors first time, they get a cache version. can someone help.?