Based on the value of a picklist field I need to render a static message in a small VF page at the top of the record in Classic UI.  I have created an Apex controller as well as the VF page, but I have not been able to make this work.  I am new to this level of development so any assistance you might be able to give would be greatly appreciated.  Basically, if a picklist field called Frequency contains one of three different values, I want to display a static text message.  Below is the code I have written so far:

Apex Class – “ContentMessageInlineCtrl”
public with sharing class ContentMessageInlineCtrl {
  public Content__c cov {get;set;}
 
  public ContentMessageInlineCtrl(ApexPages.StandardController controller) {
    if(!Test.isRunningTest()) {
      controller.addFields(new List<String>{'Frequency__c'});
    }
        cov = (Content__c) controller.getRecord();
    }
}
 
VisualForce Page = “ContentMessageInline”
<apex:page standardController="Content__c" extensions="ContentMessageInlineCtrl">
    <style type="text/css">
        .redAlert {
            font-weight: bold;
            color: #FF0000;
            font-size : 22px;
            text-decoration: none;
        }
       
    </style>
   
    <apex:form >
        <apex:outputPanel rendered="{if(!(Frequency__c == “Weekly”||Frequency__c == “Semi Monthly (Twice a month)”||
        Frequency__c == “Bi Weekly (Every Other week)”)true,false)}">          
            <center>
               <apex:outputText styleClass="redAlert" value="THIS IS WHERE THE STATIC MESSAGE WILL RESIDE"/> <br/>
            </center>
        </apex:outputPanel>
    </apex:form>
</apex:page>