You must use this page to assign permission to defined roles.
On the left side of the page you will see a list containing all the items in the menu.
If you want to see all the actions related to a menu completely, click on the menu name, otherwise you will have access to the sub-menus by clicking the arrow next to each item.
Clicking on any item will display a list of selected menu actions on the right side of the screen. If you want to access one or more actions, select it by clicking on the related box.
If you want to select all items, click on the box related to 
to get the desired result.
After the desired permissions are applied, click the
.