in the select tool - right click on the 'lock aspect ratio' padlock icon on the infobar and untick smart transform - this will enable you to deform the bitmap image using the boundary handles

xara has a mould tool but it does not work that well with bitmap image, especially low res images, but it does have perspective options

there is always crop.... although that does not deform

like acorn said xara is not photoshop and once again I would not be doing this in xara....