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 (frequently 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 in a particular JIRA project.
The following, inserted in wiki markup
[TEST-3@JIRA]
produces this link: TEST-3@JIRA. Select the link to see the page for the TEST-3 issue in the Demo Project (TEST) JIRA project.