Open the Linux terminal and Type cd /etc/arangodb and then type ls -l as shown below

This will open the file arangod.conf and now you can edit the file (ensure endpoint is still 0.0.0.0:8529 as shown below)

Ctrl + O to save the changes, press enter at the prompt shown below. Then Ctrl+X to exit the file/editor.

Ctrl + O to save the changes, press enter at the prompt shown below. Then Ctrl+X to exit the file/editor.