i used the vi text editor in xterm to edit ths file, but that's probably a bit too linux hardcore. if you fancy a go though....

open xterm and enter the following commands
vi /home/user/.carman/carman.conf

use the arrow keys to navigatge to the start of the text you want to edit.

press the x key to delete each character one at a time

press I (has to be upper-case) to change vi into insert mode. the cursor will go to the start of the line.

use the arrow keys to navigate to the position

enter the new text, then press esc on the toolbar to exit insert mode

enter the following characters :wq (colon, then w for write/save and q for quit)

vi is daunting at first but is ok once you know what is going on, and is on just about every unix system there is so kis a very useful skill to have.