How to edit ECDSA fingerprint?

[joe at actionline.com]

I got the warning message shown below and would like to know if it is
possible/permissible to edit my /home/joe/.ssh/known_hosts in a text
editor.

Here are the first few characters on the long lines now in my known_hosts
file:

192.168.0.73 ssh-rsa AAAAB3NzaC1yc2EAAAABI ...
box582.bluehost.com,66.147.242.182 ssh-rsa ...
192.168.0.75 ssh-rsa AAAAB3NzaC1yc2EAAAABI ...
localhost ssh-rsa AAAAB3NzaC1yc2EAAAABIwAA ...
192.168.0.71 ssh-rsa AAAAB3NzaC1yc2EAAAABI ...
vsiq.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAA ...
98.102.104.47 ssh-rsa AAAAB3NzaC1yc2EAAAAB ...
192.168.0.80 ssh-rsa AAAAB3NzaC1yc2EAAAABI ...
192.168.0.91 ssh-rsa AAAAB3NzaC1yc2EAAAABI ...
192.168.0.64 ecdsa-sha2-nistp256 AAAAE2V ...

What exactly do I need to put in there to correct the reported problem?

-------
WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
f7:d3:24:83:f8:fa:50:00:6f:82:2a:eb:3e:6b:25:51.
Please contact your system administrator.
Add correct host key in /home/joe/.ssh/known_hosts to get rid of this
message.
Offending ECDSA key in /home/joe/.ssh/known_hosts:10
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle
attacks.
Permission denied (publickey,password).
lost connection