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Logged in as admin go to System Admin->Blocks and scroll down the list untill you find the appropriate block you want to have showing on your site. Select left, right, or middle, it's weight etc.
If you want to customise the block beyond it's default, if you have your template cloned, you can do so there. Templates are found in System Admin->Templates.
If you see only the default template, CLONE it, then go to System Admin->Preferences->General Options and set the template you JUST cloned as the default.
Go back to System Admin->Templates and look for the IPB blocks templates and edit the apropriate block, save and your done.
Alternately, you can also go back to your Block administration, look for the IPB block you want, click edit and inside you will (usualy) find an Edit Template link that will take you directly to your block html file.
Once you start looking around the system all this will become second nature. If you make a mistake and your page won't load after editing a template, go back your default template, look for the apropriate block template and copy/paste the defaults to your cloned copy so that you can start over. Trial and error is to be expected, use proper precaution when editing with your tags etc, and all will work out nicely.
Good Luck