Sharp MX-C312 Reference Manual page 30

Releasing Prints at the MFP
To release a print job you have to select it. You do this by simply tapping
the job on the touch screen. Once the job has been selected it can be
released by selecting Print (bottom left of the touch screen).
To release all of the print jobs select Print All, this will automatically print
all of your jobs which are awaiting release:
You can delete jobs in a similar way. Select the jobs which are no longer
required and then simply select Delete
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