Using the top "Create" button"

In order to create a new Test Issue, 

Click the Create Issue at the top of the screen to open the Create Issue dialog box / page.

Step 2: Select the  Project  and on  Issue Type,  select Test.

Step 3: Under the General tab, type a Summary for the test and fill all appropriate fields — at least, the mandatory ones marked with an asterisk.

Step 4: On the Test Details tab, select the Test Type and complete all appropriate fields;Step 4a: If you are writing a Manual Test:

- Select the Test Type as Manual. 
- After filling out the Manual Steps fields, press the Add button to jump to the next Manual Step. 
- Use the Pencil button to edit a previously entered Manual Step, and press the Update button when done. 
- Use the Bin button to delete a previous entered Manual Step.
- To change a Manual Step position in the Test, drag the left area of the row and drop it to the desired place.

Step 4b: If you are writing a Cucumber Test:
- Select the Test Type as Cucumber. 
- On Cucumber Type, select either Scenario or Scenario Outline as test type. 
- On Cucumber Scenario, enter the Cucumber Scenario clauses in Gherkin.

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Step 4c: If you are writing a Generic Test:
- Select the Test Type as Generic.
- On Generic Test Definition, enter the definition for the automated generic Test.

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Optional:
- Click on the Test Sets tab to associate the current issue with Test Sets.
- Click on the Pre-Conditions tab to associate the current issue with Pre-Conditions.
- Click on the Test Plans tab to associate the current issue with Test Plans. 
- Click on the Link Issues tab to link with other issues and specify the nature of the association.
- To create a series of similar tests – within the same  Project  – check the  Create another box at the bottom of the dialog. 

Step 5: When you are satisfied with the content of your test, click the Create button.

Step 5a: If you checked the Create another box, a new Create Issue dialog appears. This issue is automatically pre-populated with your previous test details, while leaving the Summary field blank.

From the requirement issue screen

In order to create a new Test Issue directly from the requirement issue screen, and link it automatically to the requirement, 

Step 1: Click the Create Issue at the top of the screen to open the Create Issue dialog box / page.

Step 2: Select the  Project and on Issue Type make sure you have Test selected.

Step 3: Under the General tab, type a Summary for the test and fill all appropriate fields — at least, the mandatory ones marked with an asterisk.