Edit the file "blockeditor.thtml" found in /layout/{professional}/admin/block/ with the following codes at the top:
Text Formatted Code
<script type="text/javascript">
// Setup editor path for FCKeditor JS Functions
geeklogEditorBasePath = "{site_url}/fckeditor/" ;
window.onload = function() {
var oFCKeditor1 = new FCKeditor( 'content' ) ;
oFCKeditor1.Config['CustomConfigurationsPath'] = geeklogEditorBaseUrl + '/fckeditor/myconfig.js';
oFCKeditor1.BasePath = geeklogEditorBasePath;
oFCKeditor1.ToolbarSet = 'editor-toolbar1';
oFCKeditor1.Height = 200 ;
oFCKeditor1.ReplaceTextarea() ;
}
</script>
Notice the word 'content' in the line:
var oFCKeditor1 = new FCKeditor( 'content' ) ;
That word is the textarea id.
Scroll down to find the textarea code like this one:
Text Formatted Code
<td><textarea name="content" rows="12" style="width:100%;">{block_content}</textarea><br>
Add id="content" so that it will look like the following:
Text Formatted Code
<td><textarea id="content" name="content" rows="12" style="width:100%;">{block_content}</textarea><br>
---Note---
If you want more advanced editor buttons, change "editor-toolbar1" to "editor-toolbar2" in the codes at the top.