SQL Developer New Connection

Hello,
I am a student, just downloaded SQL DEVELOPER.
I need to know how to create a new connection. I followed the HELP button under connection and the following directions bellow:
"To create a new database connection, right-click the Connections node and select New Database Connection. Use the dialog box to specify information about the connection (see Create/Edit/Select Database Connection). You can also create a new database connection by selecting an existing connection in that dialog box, changing the connection name, changing other connection attributes as needed, and clicking Save or Connect."
I am getting an error that states the following:
Status : Failure -Test failed: ORA-01017: invalid username/password; logon denied
I also added the system generating login SYSTEM but I could not figure out the password. I tried sys, system, admin.
Any help it will be very much appretiated.

Did you create the database, or did it already exist?
The default system password is manager, but you are normally asked to specifiy a password when creating the database.
If someone else created the database, you will have to ask them for the password.

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