Problems moving text

I’m having a problem using the text tool. When I applied the text to a shape it was at first editable. Now, it’s not. How do I fix this or avoid this problem in the future? The text on the Red shape is not editable anymore. The text on the yellow shape is editable. I can’t figure out why the Red shape no longer let’s me edit the text.

It seems to me you have inadvertently locked the red shape. Right-click the shape and select ‘unlock’ should do the trick.