pgAdmin 1.4 online documentation
To change your password, follow the following steps:
It is good policy to set a password to protect your data, even in 'safe' environments such as at home. In the workplace, failure to apply an appropriate password policy could leave you in breach of Data Protection laws in some circumstances.
pgAdmin does not enforce any password restrictions, however we do recommend that you consider the following guidelines when selecting passwords. This is not an exhaustive list and will not guarantee security.