The Value is not equal to condition will let you restrict an Event based on a connected Event data. You will have to specify two parameters in order for the condition to work.

The first parameter is the connected Event data Value that the second parameter, a string, should not be equal to.

By selecting Page title as Value and "start page" in Should not be equal to will restrict the Event to only trigger when the current page title is not equal to "start page".

Note that this condition must always be wired to an Event data before you can select it as a parameter.

Further reading:

Creating your first events