First, you need to find out which is the encrypted LVM partition, it may be sda3, but it can also be sda5, sdX2, ...:
Toadd a new password, use luksAddKey:
sudo cryptsetup luksAddKey /dev/sda3
Toremove an existing password, use luksRemoveKey:
sudo cryptsetup luksRemoveKey /dev/sda3
View currently used slots of the encrypted partition:
sudo cryptsetup luksDump /dev/sd3
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