wp-admin/themes.php?page=functions.php open code stuck in text box

wp-admin/themes.php?page=functions.php open code stuck in text box.

I places a table with java script inside leader board within theme options, The table did not close </td> which has locked themes.php?page=functions.php and can not remove the code or save settings now. Where is that input info stored so I can go in and manually remove that table to restore themes.php?page=functions.php to it’s normal working? You can see the box in the leader board here news weird I was trying to place a random quote in the leader board and with the broken code stuck it doesnt work.
So how to remove certain data from the themes.php?page=functions.php page?