HI there... Welcome to the Forums..
To add text to a frame..where the user has to click it...and there be different answers..you would need the full version for this..For example..
Here are a couple of threads to help guide you..
http://www.adventuremaker.com/phpBB2/viewtopic.php?t=3710&highlight=text+screen
I know there is alot there..It's text with dialogue with avatars..There is a demo on the first page..That u can download..to help better understand it..On the next page..it shows different ways of doing it...There are only 2 pages..but lots of scripting..Don't let it discourage you if it does..
On the second page..there is an option to have continual dialogue
Either way you are working with script and timed events..with text..
http://www.adventuremaker.com/phpBB2/viewtopic.php?t=3854&highlight=text+screen
There is this one here too..it's just adding text on the screen..[It stays invisible till the user clicks it..] then once they do..an answer or hint appears..
Note you can evaluate the full version of AM..within a 20 Frame limit..
Please let us know if any of those help.. Or if u need any help with any of them..

It might help more..If we knew exactly what it was u are trying to do too..
Anyhow..take a look at those threads..and let us know..~
Peace