When I create a new project I cannot find the section to open the work breakdown structure but instead there is a tab called schedule (s. screenshot). Is schedule supposed to be the same as wbs?

I am also trying to figure out how to enable changing tasks (e.g. task name), because once a task is created changes are not applied. Is there a way to enable changing tasks?
My last question: Am I able to define tasks as milestones within the wbs/schedule?
Thanks for your support.
Jasmin