How do you replace the rubber were the boot comes down on to on a 2001 peugeot 406 it is letting water into my car?

To replace the rubber seal where the boot (trunk) comes down on a 2001 Peugeot 406, first, remove any items from the boot and inspect the existing seal for damage. Carefully pull the old rubber seal out of its groove, cleaning the area thoroughly. Then, fit the new rubber seal into the groove, ensuring it sits evenly and securely. Finally, check that the boot closes properly and test for water leaks.