You need to share which module did you installed to try to find the solution.
Hi @Damian Culotta,
I tried to insert facebook pixel code through magento connect in magento admin panel. But while I am trying to install the new pixel code, the screen is coming as like its already installed. How do I edit that already installed pixel code in magento connect??
If you used MagentoConenct Manager I guess you've installed a new module.
Which module did you installed?
Can you sahre the steps you made? (1 by 1)