Hi Jessica,
Yes you can! You have to create a Custom Field and asociate it to the Create Issue Screen.
More about Adding Custom Fields can be found at: https://confluence.atlassian.com/display/AOD/Adding+a+Custom+Field
Cheers!
check this document, they have given step by step how to do it
http://www.jennywatson.net/2011/06/01/linking-from-a-jira-issue-to-a-confluence-page/
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