I created an instance but I cannot login to Ubuntu to change ports

Hi. I see it is not allowed to login to sudo or anything until I have logged in using the public SSH key I have created. I created an SSH Key within Windows command prompt last week. I have uploaded my public key to the instance and everything gets set up, but the console greets me with [user? password?]. I see ‘ubuntu’ is the default username, but I never set a password before. Do I log in with SSH some other place first? cloud.dreamhost.com gave me a warning that it is not secure. Maybe this is an old site?

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