How to specify expiration of cacheable resources?

Posted by Richard on Pro Webmasters See other posts from Pro Webmasters or by Richard
Published on 2012-11-28T15:43:54Z Indexed on 2012/11/28 23:15 UTC
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cache

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speed

I'm trying to speed up a wordpress site -- this site: http://richardclunan.net

I'm following the observations here: http://gtmetrix.com/reports/richardclunan.net/9ps7Zc0j

The first item says: "The following cacheable resources have a short freshness lifetime. Specify an expiration at least one week in the future for the following resources:"

How do I specify expirations for those things?

(I'm not very technically-minded, and likely won't know relevant terminology -- really appreciate baby-steps explanation if possible :)

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