Can i Change Instance access from longing using "ssh-key" to use " ssh credential "

I have a problem with my Instance access every time try to connect to it need the private key to log in

so when I want to use my server in another place or copy files to my server need the private key

...
PS C:\Users\<REMOVED>> pscp C:\Users\<REMOVED>\Desktop\test.txt root@<REMOVED>:~
FATAL ERROR: No supported authentication methods available (server sent: publickey)
PS C:\Users\<REMOVED>> pscp C:\Users\<REMOVED>\Desktop\test.txt root@<REMOVED>:~

so I need it when try to connect to my server by SSH and ask for a username and password