Well I am not sure what you really am looking for nor who gave the advice.
but you have a couple of methods.
1. Turn on forum introductions.
Control Panel » Forum Settings
Select the Custom inserts tab
The top three fields is what you are interested in.
2. Add Meta tags
Control Panel » Display Options
Select the HTML Includes Tab
Add what you want to:
Header Insert:
Use for meta tags, etc.
not
Default Header:
