Here is how to edit & reject article submissions in your team blog.
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​Step 1: Click on your Profile Picture and then my blog option.

Step 2: Click on the Blog Dashboard from the dropdown.

Step 3: From the drop-down above, choose the Team Blog publication.

Then go to Submission Tab on the left side panel. You can see the article submissions by your team members. Select the article from the list displayed and click on Edit & Publish to edit before publishing, and Reject to reject the submission.