Remove the tap head. Sometimes they pull off, sometimes they are held on with a hidden grub screw & sometimes they are held on with a screw under the indices( the cap thing that's coloured blue or red or says hot or cold) on the handle at the end.

Remove the handle (sometimes they have to be 'encouraged' off) and then remove the 'shroud'. Most screw off (anti-clockwise) but some just slide off.