In PROF mode, during climb, cruise, or descent, a box appears around the corresponding mode on the annunciator panel, indicating that it is being controlled by the FMS/MCDU.
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To manually enter a speed into the FMC/MCDU, open the "TACT MODE" page and enter the speed at LSK 4L. An asterisk appears next to the entered speed; this indicates that the action affects the active flight plan and requires pilot confirmation.
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Pressing the LSK 4L button again confirms the speed change. The asterisk disappears, the speed is displayed in large font, and the speed indication on the speed tape switches to the selected value. The autopilot should now follow the selected speed.
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I'm not sure if that was your question, but I hope it helps.