disappearing tweets

Hi there,

Thank you for this plugin. I would like to ask about how to keep the tweets displayed that are a few weeks old. Mine seem to disappear when a new tweet appears. I would like to keep say up to 12 tweets at a time. Please advise.

Many thanks,
Aisling

Refer to:http://www.patrickandashleywedding.com/patashwedding/

https://ww.wp.xz.cn/plugins/twitter-hashtag-feed-widget/