When posting payments you have the choice to schedule the run, if you select Yes the payment run is deferred until the schedules task is run
You need to navigate to the following area:
From the Toolbar you want to click System Admin
Then select Scheduler
Then TaskScheduler
Within the window, you should find a task called Deferred Transaction Updates. Double click this.
Ensure on the next window the Company Code is set to the company where you need to release the transactions.
Press Right Mouse Button and select Execute
This will change the status of the payment run from Deferred so you're able to carry on.