The obvious answer - click "create" in the menu or at the bottom of the backlog.
If you don't have the "create" option, then your account does not have any project permission to create issues (cards) - you'll need to talk to your administrators to get that added.
If that's not what is blocking you creating issues, then I'm afraid you will need to give us a lot more information on why you can't create issues.
Hello, Atlassian Community! I thought it would be fun to do something different for my teams' last retrospective of 2019 so I'm planning to do a "year in review" with info-graphics. Wha...
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