1) Edit the index.jsp file in iam_im.ear\user_console.war\app\ui7 folder, assuming you are using the ui7 skin.
2) To remove the Help link you can either comment out or delete this line:
<a href="../help.jsp" target="WWHFrame" onclick="return imHelp();" class="headerTxt"><skin:img src="helpicon.gif" altKey="console.help" titleKey="console.help" width="12" height="13"/> <skin:message key="console.help" />
If instead you want to change the page loaded by the Help link then you could edit the above line to change the target address and to remove the onclick function such as:
<a href="http://www.broadcom.com" target="WWHFrame" class="headerTxt"><skin:img src="helpicon.gif" altKey="console.help" titleKey="console.help" width="12" height="13"/> <skin:message key="console.help" />
3) Restart IDM