You can reference the documents at:
https://www.ubbcentral.com/docs.phpselect the administration guide.
It will help to explain what the different settings are but not much help to actually take you through the steps.
The first item is to add a forum.
goto:
Control Panel » Forum Settings
there will be a link on the bottom looks like a tab.
"add new forum" select it.
There will be items to fill out,refer to the guide for explanation of what each one does.
When done giving a name,etc.
Select the add new forum button.
Now you need to allow people to see and use the forum including yourself.
when adding a new forum it will take you to:
Control Panel » Forum Permissions
Here you need to set what features are available for each user group.
in most cases a feature is enabled if set to 1 and disabled if set to 0.
So if you click on the first option:
Can see forum
You will see the groups there.
for example
Administrators
GlobalModerators
Moderators
Users
Set the admin to 1 so you can see it
And you probably want to set users and guests to a 1
A guest is a non registered person
And a user group is the default registered members.
Now all you have done is allow those people to see the forum.
So you need to go through the rest of the permission settings
Now some settings will be enabled by default using the new forum template.
But you should double check them anyway.
when done select the "update this forums permissions" button.
Then go to your site and you should see the forum you created.