Technomancers can use all matrix actions that a decker can use
(plus their techno magic resonance mumbo jumbo).
so...
A technomancer would use the normal jack out action
(like most deckers would use as well).
My point was more that, as they have no plug to pull, there are two possibilities:
1) The action does not have to be the physical pulling of a plug
2) Technomancers do not have access to it