To put a link to a single JIRA issue on a wiki page, enter a shortcut in the wiki markup, for example:
[TIGER-1@JIRA]
where TIGER is the key (typically your project name with no spaces) and 1 is the issue number and @JIRA is the shortcut for the part of the URL that is common for all issues on a particular JIRA site.
The following markup
[TEST-3@JIRA]
produces this link: TEST-3@JIRA. Click the link to see the page for the TEST-3 issue on the CBIIT JIRA site (Tracker).