Log on to the computer where Lync Server Management Shell is installed as a member of the RTCUniversalServerAdmins group or with the necessary user rights as described in Delegate Setup Permissions.

Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2013, and then click Lync Server Management Shell.

List all the announcements in your organization. At the command line, run:

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Get-CsAnnouncement

In the resulting list, locate the announcement you want to delete, and copy the GUID. Then, at the command line, run:

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Remove-CsAnnouncement -Identity "<Service:service ID/guid>"

For example:

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Remove-CsAnnouncement -Identity "ApplicationServer:Redmond.contoso.com/1951f734-c80f-4fb2-965d-51807c792b90"

Note:
For details about more options, see Get-CsAnnouncement and Remove-CsAnnouncement.