There are following steps by which you'll change Outlook password to urge access to the PST file. Please follow the below steps:
In MS Outlook 2013, attend Home button
From the menu, choose Info and click on the Account Settings option
Account Settings panel will appear then switch so far Files tab
Under the chosen tab, choose the Settings option
Now, the Outlook file panel appears and you'll find Change Password option
At present, you've got to settle on a robust password to secure tip. For enhanced security, you'll keep it during a password keeper.