I have folder permissions in CMS so why can I not add URL aliases?
You will not be able to create URL aliases if you are not set as a Website Admin on the CMS side of your instance. Please have a CMS website admin add you to this list by logging into CMS and going to this list:
Reports & Tools - All Reports & Tools - Site Management - Website Administrators
Once you are added to this list, you will be able to create the URL alias.