Cannot change the password of administrator@vsphere.local from the vSphere Web Client dropdown menu

  Symptoms

• The Change Password option is greyed out in the dropdown menu when you log in as Administrator@vSphere.local.
• You cannot change the password as an Administrator.
• A standard user logging in to the vCenter Single Sign-On (SSO) server from the vSphere Web Client can perform a password change from the dropdown menu.

Resolution

To resolve this issue, you must change the password for the Administrator.

To change the password for the Administrator:

1. Log into the vSphere Web Client with an SSO administrator user
2. Click Administration.
3. Click Users and Groups under Single Sign-On.
4. Right-click Administrator under the Users tab.
5. Click Edit User.
6. Change the password for the Administrator.
   
   Note: If the Edit User dialog box for the Administrator@vSphere.local is greyed out, see Cannot change the administrator@vsphere.local password after upgrading from vCenter Server 5.1 to 5.5 (2061122).

Related Information

To know more check the below articles: 
SSO administrator is locked or expired -  Reset the vCenter SSO Administrator Password
vSphere 5.5 Single Sign-On administrator@vsphere.local password issues 
Cannot change the administrator@vsphere.local password after upgrading from vCenter Server 5.1 to 5.5
Resetting the vCenter SSO Administrator Password - SSO administrator is locked or expired  ​​​​​​​​​​​

Read the article in different language here:
vSphere Web Client ドロップダウン メニューから administrator@vsphere.local のパスワードを変更できない

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