During the installation of Vault Server (Vault Collaboration or Vault Professional) whilst setting up an SQL replication environment, you are given the option to insert the user-name and password of the user account who will access the "Shared Folder". You would like to know how to change this after the installation.
This can be achieved by running SQL Management Studio.
Right click on Replication
Click "Update Replication Passwords"
Repeat this process for all Subscriber Servers as well.