Working with PDFs: Using the Edit Document Text tool, you position the cursor at the point in the document where you want to insert new text, and type. The backspace and delete keys work like they normally do in a typical text editor, and you can use the mouse to highlight words, letters and other characters.
You can manipulate the size of a body of text. When you select the Edit Object tool and click on a row of text, the application surrounds it with a rectangle, marked with four anchor points at the corners. Clicking, holding and dragging any of these corners inward will shrink the text font size, and dragging outward will increase it.
Click anywhere within the rectangular boundary, hold the left mouse button, and you can drag the row of text to place it in another part of the document.
(One thing to keep in mind when you edit text in a PDF document: The lines of text don't automatically "wrap." If you add more words, the row will extend toward the right. If you remove text, the row's length will shorten. But in either case, the row below it will not automatically link to the end of the row you edited, and the flow of the rest of the text in the paragraph will not automatically be reformatted.)