I haven't set up Time Machine on my new system yet, but here's what the Help in OS X advises:
To restore files:
"Open a window for the item you want to restore. (e.g. Applications/)
Click the Time Machine icon in the Dock.
If Time Machine isnâ€™t in the Dock, look for it in the Applications folder.
Use the arrows or the timeline along the right side of your screen to browse through all the backups Time Machine has created.
If you need more information about an item, double-click to preview it.
The windows behave just like Finder windows, so you can open folders, click items in the sidebar, and use the search field in the upper-right corner of the window.
When you find the item you want to restore, select it and then click Restore.
You can restore individual items, multiple items, folders, or your entire hard disk.
If an item you restore has the same name as another item on your computer, youâ€™re asked if you want to keep the current item, the restored item, or both."