how do I tie an issue to a checklist?

Web

1. Click on the project

2. Click on "review items"

3. Navigate to a checklist item

4. Click " add issue"

5. Click "add new  issue"

6. Click "create issue"

iPhone

1. Press on the project

2. Press on "Checklists"

3. Navigate to a checklist item 

4. Press on related issue and add an issue

5. Press "save issue"

Android

1. Press on  project

2. Select "Checklists"

3. Navigate to a checklist item

4. Press on "related issues"

5. Press "add new issue"