question about lettering

i was doing fine, editing some letters. I took one of those for dummies book cover pics. I wanted to change the the learn ------------ for dummies into a cover page for a portfolio i'm handing in. At first it was good, now when i click the horizontal type tool it has some square surrounding the I that shows where your moving your mouse, and i cant highlight text that is already there to edit it, (change size or color) how do i get rid of that square thing and highlight my text? thanks for any help

I am not sure I understand what you mean, but could it be that your text no longer is a text layer? Is it a letter T in your text layer in the layer palette? If not the text has been rasterized and can not be edited.

Can you make a screenshot? On Windows, push Shift-Printscreen, make a new Photoshop document, and paste; on Mac, push Cmd-Shift-3 (whole screen) or Cmd-Shift-4 (select part of the screen), then convert the resulting file to JPG or GIF.