Do you know where the properties box/window even is? When you click on/select the text box there is an option in the properties window to change the text box to static/dynamic/input.
If you can't find the properties window try looking for it in the 'window' bar up the top of the screen.
Sticky
You have to change the text to static in the properties box. It sounds like it is on dynamic at the moment.
Sidorio (Updated )
How would I do that?