Open the Roles module in the Setup section
Click Create Security Rolein the top right corner.
Fill in the security role name, and select the wanted permissions from the tree.
Click Create.
Filters can be used to locate permissions in the tree.
Within the modal you can find quick filters to easier navigate the tree.
DELETE - Permission to delete an object GET - Permission to retrieve an object POST - Permission to create an object PUT - Permission to update an object PAGE - Permission to access a page ACTION - Permission to execute actions