On the Companies House record all officers and PSCs have a Correspondence Address. This is where any formal documents being 'served' on a Director, Secretary or PSC to the company will be sent.

Within Inform Direct the correspondence is referred to as Service address.
Entering the service address will be a requirement when adding a new officer or PSC and can be changed by following the below:

Click on the Officers or PSCs tab, depending on which record you wish to update the service address of.

Select the yellow pencil next to the officer/PSC and 'Edit service address'. 

Note: The officer and PSC service addresses can differ. You will therefore need to update both separately if a new address is required for somebody as a director and PSC

If you require more detailed guidance then please see:

How do I edit a Director or Secretary's Service address?

How Do I Edit the PSC Service Address?