You can add new text to a file by placing the insert point anywhere in the file (click SELECT in the desired location) and typing the new text there. Likewise, you can delete characters by placing the text caret at the end of the character string you want to delete, and backspacing over those characters.
Another way to delete a character string is to cut it. This places the text string in a system clipboard, and if you want you can paste it elsewhere. To cut and paste a text string, do the following:
Click SELECT to the left of the first character in the string that you would like to cut.
Click ADJUST to the right of the last character in the string.
The text string is highlighted.
Press MENU to display the window pane's pop-up menu, drag the pointer down to highlight Edit, and to the right to highlight Cut.
The text string is placed in the system clipboard. (Alternatively you can use the Cut button on the keyboard, if there is one, or Meta-x.)
Move the pointer to the destination where you would like to paste the text string and click SELECT to position the caret there.
Press MENU to display the window pane's pop-up menu, drag the pointer down to highlight Edit, and to the right to highlight Paste.
The text string appears in the new location. (Alternatively, you can use the Paste button on the keyboard, if there is one, or Meta-v.)