Basic questions that documentation would resolve...

How can I link the module to my SendGrid account?

Also, how do I modify the appearance. I was able to nearly delete the header and description by inserting a space in these fields; however, I cannot get rid of the rocket icon. Moreover, I would like to modify the appearance of the front-end fields and button, if possible.

Lastly, you should modify your forum form... There is zero need for me to share my site credentials for these questions to be addressed.