how to I remove the JotForm Branding from the Thank You page?

Also can i change my username to show my company name when the email form is sent

Hello,

Thank you for contacting us.

I have checked your account and could see that you are FREE. Unfortunately, it is not possible to remove the JotForm branding on Thank you page from a free account. If you want to remove the JotForm branding, you will have to upgrade your account to paid plans:

https://www.jotform.com/help/331-How-to-Upgrade-My-Account

Also, we can change your username on our side. Please provide us with the new username that you would like to use, it should be available for us to make the change, a good way to know, if the username is available by checking it on the sign-up page: https://www.jotform.com/signup 

Type the username that you would like to use and it should tell you if this is either available or not.

If you want to change Sender name on Notification e-mail, you can change it on the Email Settings:

Here is a guide helps to you: https://www.jotform.com/help/25-Setting-Up-Email-Notifications

Please let us know if you need any further assistance.