Setting up a new user for MySQL database hosted on amazon RDS

After going through all the motions to create a database instance on AWS using the RDS tool I've been able to access the database through MySQL Workbench. I've used the master username and password chosen on creation of the instance.

However I wish to create new users who have restricted privileges and can't seem to achieve this without returning an error.

As one can see I've tried it through workbench as well as gitbash and recieved the linked errors.

Here's an image of the interface. I've tried creating a user with zero privaleges and still the same error messages. I know the privilege 'SUPER' can't be granted.

Any help is appreciated!