If an employee is waiting for approval from a manager to be able to attend a training event, you can approve this from within your Training event settings.
Logged in as an admin or training administrator, click your name in the top right, then click Settings.
On the settings menu, click Employee data, then click Training events.
Under Training events, you'll see the relevant training event. If there are any employees waiting for approval, it will say, for example, Awaiting approval: 1.
Click Awaiting approval.You can then either Approve or Decline the approval request.