1- When you install Master Data Services using SQL Server installation media, during the installation you have a choice to add users to have access (Admin) on Master data services Roles, however if you forget to add anyone and complete installation, you will not have access to the Master Data Services Website Roles thus get an error " Access denied " when you browse the newly created website.
2- Only the person(User) who installed and created the website will be able to browse the contents. Once that particular user browse the contents, you get Master Data Services Website Page look like shown in Fig 2.0.
1- Click on User and Group Permissions
2- Click on Add (+) button. You have an option to add Groups as well, you need to click on Group instead of users in that case.
3- Provide the user name and verify with Active directory, once verified click ok
4- Once added, high light that particular user and click on Edit Icon as shown below
5- Click on Functions and select proper permission from drop down menu
6- Click on Edit again and select the functions you would like the user to perform. Once completed click on save and have user try again accessing the URL.