AWS password instead of key pair

I'm a total newbie when it comes to AWS. I'm trying to launch a Ubuntu instance and since I use a cloud IDE and don't to make things needlessly complicated I don't want to generate a key pair but rather a username/password, so I choose "continue without a key pair". I have to agree that I know that I'm not able to login without the username/password but it never gives me any...

What's the deal with this? What should I do?

Also, when I press connect it says:

Instance is not associated with a key pair This instance is not associated with a key pair. Without a key pair you will need to log into this instance using a valid username and password combination.

But it never actually gives me any boxes to put in the username/password I don't have anyway. Why do they even have this function if it doesn't exist?