This repo is intended to be applied to an AWS account on an IAM user with full admin permissions, meaning you have used the root account to create an IAM user and are now using the said user to apply this terraform code.
Set the name of your aws profile and email address in a .tfvars file you should create this locally in the Modules folder. Your profile name can be found by looking in your .aws folder in the credentails file. If the file is empty or is not there run aws configure --profile profilename where profilename is the name of the profile you will create and follow the prompts to add your access key and secret access key.