In the Pages section of the claim you can see the number of saved claim lines by the number in brackets next to Existing Lines
On using the existing lines link, to then remove an expense claim line select the cross to the left of the grid.
To view the full details of the expense claim line select the information icon from the grid, a panel below will list the full details of the expense and from here details can be edited.
Any warning messages will be displayed on the claim line and you can also add notes on the claim line.