First off you appear to have created the table okay judging by the message:-
"Your SQL query has been executed successfully (Query took 1.2207 sec)"
If the operation had failed you would know about it because phpmyadmin throws up a huge big [color=#CC0000]red[/color] error message.
You may not see the table smf_forums until you refresh/reload phpmyadmin. What I do is go to the database drop down on the left panel and select the information_schema database. Then back to the drop down and reselect your database. Now your new table will show up.
Without really knowing what you are trying to achieve I can only suggest that your next stage would be as suggested by Goosemouse in the forum link you posted.
The catlist numbers are the numbers of the categories you want to show up for each forum. You will need to add your category numbers into the database for it to work. If you look at the link to each category on your forum you can figure out what each number is. That will fix your empty forum problem.
Which suggests that you manually enter the catlist and forumname data which you can do from phpmyadmin using the Insert option and following the GUI. The Browse option will let you view your table.
I would suggest double checking the table smf_forums exists in the database and then go back to the Simple Machines forum and ask them again what details are entered into the table now you have created it.
Opinions are my own views, not DreamHosts'.
I am NOT a DreamHost employee OK!! :@
You act on my advice at your own risk!