SSH: Switch from public key authentication to password authentication

Solution 1:

If you want to do this temporarily, you could connect to the server with ssh -o 'PubkeyAuthentication no' server. If you want to do this permanently, on the server you could remove your public key from ~/.ssh/authorized_keys or on your computer you could add the following to ~/.ssh/config

Hostname server
PubkeyAuthentication no

Solution 2:

The PasswordAuthentication option in the /etc/ssh/sshd_config file controls whether passwords are allowed.

Really, though. Use public keys.