Windows XP Home
Access the task scheduler via the Start menu (All Programs -> Accessories -> System Tools -> Scheduled Tasks). To remove a Scheduled Task from the list select a task and delete.
Go to the Control Panel, switch to Classic View (option on the left of the window), double-click Administrative Tools, then double-click Task Scheduler. On the left of the Task Scheduler window you must expand the tree to Task Scheduler (Local) > Task Scheduler Library > 2BrightSparks > SyncBack (if SyncBackSE, or > SyncBackPro / SyncBackFree, as/if appropriate). Under the appropriate node are entries for users (with a machine name prefix). Click on the node that includes your login username.
Windows 7 and 8
Go to the Control Panel > [System & Security >] Administrative Tools > Task Scheduler. Then as per the instructions for Vista above to find the actual Tasks. You may (depending on your Windows configuration) also have a shortcut to Administrative Tools directly on the Start menu. You can set one by right-clicking Start orb > Properties > Customize > System administrative tools if you wish.
Note: in recent versions of Windows, you can also get to the Task Scheduler by right-clicking (My) Computer > Manage > [System Tools] > Task Scheduler.