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Add test case to test cycle from the Jira issue view
To add a test case to the test cycle, you need to click on the menu [...] next to the test case name in the Jira issue and then [+ Add To Test Cycle], then a modal window will appear in which you will select the test cycle.
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Add test case to test cycle from Test Cycle page
It also possible to add test cases to the test cycle directly from the Test Cycle page.
Go to the Test Cycle Overview page, click on the Test Cycle you want to modify, and select the Test Cases tab. Click the +Add more button and choose the test case that you want to add.
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