To create costumer types, you can go to Customers -> Customers type.
Here you can see the list of customer types you have created. In case you do not have any the list will be empty.
To create a new type, you can press on . On the next screen you can write the name of the group and a description if you want. Do not forget to press update!
If you want to create new groups, you can go to Customers -> Groups.
Once you are there, you will see the list of existing groups.
To create a new group, press on . In the next window you can write the name of the group and a description. Always remember to click update.