Change the logo on contract email

I'm new to jotform and trying it out but when I get a notification that a contract has been signed, I get an email with another logo. I'm assuming it's because of the contact template I chose, but how do I change that?

While editing your form, click on the "Emails" tab.  Then, mouse over your email notification and click on "Edit":

From there, change the contents of your email notification to whatever you would like.  Save your changes to complete the update.