Creating a funnel is easy. Click on Create funnel and build the desired path by selecting proper events or screens as the next steps. In case your users can complete the expected action by visiting a few different screens at one point, you can also group all of them together in one step. For example, if it doesn't matter if your users started their journey by logging in or registering a new account, you can select the "login_screen" or "registration_screen" as the starting point.
Choose if you want to group it by the app version, device size, OS version or Platform and click View funnel. If you want to be able to come back to this funnel easily in the future, save it by clicking Save funnel.