Hola Luis!
If you really want to be confused (:P), try comparing overlook to supervise...! :)
Also, you are making a common mistake with your editing: you are selecting the text you want to modify, and then clicking the appropriate button from the controls above the message section here. If you do this, it replaces your selected text with the code to effect the editing change.
For example:
If I type the text ‘hurricane’...
...then select the text…
...then click the http://www.yourdictionary.com/images/agoraimages/bold.gif button…
the editor replaces the selected text with the code for boldface, i.e. .
The best practice is to click the function you want from the editing toolbar without having the text selected, so it will not be replaced with the editing code.
I hope I didn’t confuse you with my attempt at instructions! :)
Atentamente,
Tim