I'm not sure we have enough info to help here. Firstly, that link you gave doesn't work. Secondly, some layers may be locked in the layers palette, so you could check that first. It may be that the text has been converted to outlines to save you having to load the font on your computer. In that case, you can't change it back to text.
I'd say it's unlikely that you'd need to crop anything, though.