I forgot how to add text to the start up screen of the map...
you mean the map's levelshot?
the levelshot is an .jpg file and all you would have to do is go into Paint or whatever you use for that kinda stuff and add the text than save it and put it in levelshots/yourmap.jpg <-has to be the same name as the .bsp file
Also -
In the worldspawn add:
Key: message
Value: Text etc some text