For Single engine use Gn DOT level = N1 75%, to configure reduce N1 to 65% and select F2,Gear,F3. At glideslope take Flap full and N1 73-75%)
These are ball park figures - use the speed trend arrow and make SMALL adjustments accordingly.
On EPR Airbus N1 is still indicated below the EPR gauge (I think).
Look at Gross weight (displayed bottom right of lower ECAM (SD Screen).
For ball park setting - Single engine = GW + 10%, two engine = GW -5%
A4