After selecting Services, Adding a new service, selecting Webrunner and the latest release, you should reach the Webrunner configuration menu.
There are two software types available.
Default will install a single Webrunner on a available node partition, whereas
Resilient will create three instances on machines in physcially different locations. Give your Webrunner a recognizable name, select Resilient, then click Proceed to continue and request instantiation.