In most situations where you are entering a line of text in the Cambridge Z88, such as in response to a prompt, the following commands are available to make corrections and alterations to what you are typing:

,moves the cursor left and right
,moves the cursor to the beginning or end of a line 
, moves the cursor to the previous or next word of a line 

deletes the previous character 
deletes the character at the cursor position
Ddeletes to the end of the line
Tdeletes a word