vi editor not working , insert and delete not working in ssh
How to fix non-responsive navigation keys in "less" and "vi" editors?
Overview: This article addresses the issue of non-responsive navigation keys such as "Page Up/Down, Home/End, Ins/Del" in "less" and "vi" editors.
Step 1: Try different options of Terminal Emulation in account preferences:
Step 2: vt102 or xterm might work. Sometimes you may have to change the terminal emulation of your SSH client such as PuTTY.