If you want to change a users email, you will have to create a new user. 

If you dont have the access to create a new user within your company's RAYVN profile, contact the RAYVN admin for your company, and ask them to create a new user for you, using the new email you want. 

To read more on how to create a new user, click here.

Once you have gotten a new user, the old user should be deleted. 

If you need to change your password, you can read more on that here.