.. _editorlink: Editor links ============ :term:`Editor links ` form a connection between the Numbas LTI tool provider and an instance of the Numbas editor, allowing instructors to select exams from a list inside the LTI tool, rather than downloading an exam package to their own computer and then uploading it to the LTI tool. The `public Numbas editor hosted by mathcentre `_ provides a wealth of ready-made exams on a variety of subjects. .. _add-editor-link: Creating an editor link *********************** From the :ref:`admin interface `, click on the :guilabel:`Editor links` button at the top of the screen. Click on the :guilabel:`Connect to a Numbas editor` button. In the :guilabel:`Base URL of the editor` field, enter the address of the Numbas editor. The address of the public editor hosted by mathcentre is:: https://numbas.mathcentre.ac.uk Once you've created an editor link, you can select the :ref:`projects ` from the editor that you want to use. Only projects which are :ref:`marked visible to non-members ` are available. This is because the editor link has no authentication mechanism, and linked projects are available to all :ref:`consumers `. Once you have selected some projects, published exams from those projects will be available for instructors to pick on the :ref:`new Numbas activity ` screen.