I need to change my account username

I need to change my account User Name to my company name KNS Group.

As requested, I have changed your username to KNSGroup (without space). You should clear your browser cookies for Jotform then log in again using the new username. 

Also, note that you will need to update the custom form URLs if you are using one in your forms. 

https://www.jotform.com/help/261-How-to-create-a-Custom-URL-of-a-form