Can't select a text box that's off my schedule

I moved a text box off of my schedule and now I can't select it to move or delete it. Help!

The text might be a symbol note associated with one of the symbols on the schedule. Here's how to find it.

Select a symbol.
On the toolbar, click the Notes tab.
Continue to select symbols on the row (use the right mouse key if the schedule is crowded.)
Once the symbol notes text matches the text which needs to be deleted, clear it out and press Apply Text Changes.