WorkBench requires you to create a Project for each of the subversion repositories that you wish to work on.
From the Action menu select Project Add to start the Add Project Wizard.
After the Add project wizard has setup a new project for you checkout the sources.
Select the project on the tree control and then select the menu Action Checkout.
The Action menu will list all the commands that apply to the selected item in the tree control or the list control. You can also Right-Click (Ctrl-Click on the Mac) to get a pop-up menu.
WorkBench can optionally add the names of TAGs to the history command output.
Note: WorkBench uses the revision of the TAG to work out where in the history list the TAG should be shown. This works very well if TAGs are created from the HEAD of trunk.