Not able to change the home page for our organisation as the IE maintenance not available in the Windows 2012 GPO

Hi  

When I joined this organisation Window 2008 was our AD and I don’t know how the migration was done from other windows server version to windows 2008 by my predecessors.

Now an IT services company migrated our server from windows 2008 to windows 2012, they built new windows 2012 servers and moved the AD from windows 2008 and all the roles. We use window XP and windows7 as the client and slowly planned to migrate all client PCs to windows 7

Now the staffs have requested to have their home page as our organisation website.

I wanted to do this on the GPO. I ran GPMC.MSC  from RUN and  under the staff OU , I can see a GPO applied .If I click this GPO , on the right hand side , I can see Scope, Details,Settings,Delegation.

Under settings –User Configuration- Policies- Windows settings
  - Internet explorer Maintenance
       -Connections/Proxy settings
I can see the existing Proxy server settings configured there.


Under URLs/Important URLs
    I can see our existing home page URL.

I want to do two things here:
Firstly: I have a new proxy server address and I want to change the proxy address.
Secondly: I want to change the home page to a new URL, so that when staff logs in open the browser they get the home page as what I set up.

I can’t do any changes here because it is greyed.

So I right clicked the policy and edit and it opened the Computer Configuration and User configuration

I can see Policies- Windows settings- and I cannot see the Internet explorer maintenance

Am I looking at the right place , or do I need to do anything for the for the Internet explore maintenance to appear, so that I can remove the old proxy settings and the home page URL and put new settings.

Any help much appreciated.

Thanks in advance!