Do you have an Oracle database installed? The host / port / sid in your connection details imply a default Oracle 11g Express Edition installation, but you also would need to have created a "jtvteach" user first in that database, which seems unlikely.
If you want to use MySQL, then you would need to add a JDBC driver for MySQL via Tools > Preferences > Database > Third Party JDBC Drivers, something like mysql-connector-java-5.1.27-bin.jar.
I suggest that you read through the following blog post and see it sheds any light...
As for the String index out of range: 13369 message, I believe the 13369 is an index offset rather than an error number. In any event, it is an unusual message to get during a connect attempt.