If it's a legacy channel, you need to link it to a Google Account to access it. Here's how: https://goo.gl/z8YXdy . Also, if you don’t remember your old YouTube password, unfortunately there is no password recovery option for these accounts.
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
If it's a legacy channel, you need to link it to a Google Account to access it. Here's how: https://goo.gl/z8YXdy . Also, if you don’t remember your old YouTube password, unfortunately there is no password recovery option for these accounts.