Click More in bottom right corner

Go to Parts Inventory tab

Select Part to set Minimum Quantity

Click 3 dots (⋮) next to Restock in top right corner

Select Edit

Enter Minimum Quantity of part in Minimum Quantity field 

Click Update in top right corner

Go to Parts Inventory tab

Select Part to set Minimum Quantity

Click 3 dots (⋮) next to Restock in top right corner

Select Edit

Enter Minimum Quantity of part in Minimum Quantity field

Click Update in bottom right corner