After you have created roles in the system, you need to assign permissions to those roles. These permissions can be a combination of view / insert / update / delete. Use the following link to do so -
Super Admin --> Permissions --> Role Permissions
On this page from the drop down menu select the module. After that select the role you created for that module. The next drop-down gives you the option to select which dashboard you want for this role. Then check the relevant fields according to the name of the pages and click save.
After you have done this process you then need to assign this role to the user. Click Here to see how to do that.