This page allows you to view and change the permissions for each role. The table displayed shows permissions on the Y axis, and roles on the X axis.
For each permission, you can select the tickbox under a role to give that role full access to that permission; or you can press the blue arrow next to a permission to expand to specific permissions:
These are ordered by how much permission they grant you. To have
DELETE permission, you must also have
GET. To have
EDIT, you must also have
ALLOW grants access to everything.