To get started go to Admin menu > Content > Add content > Webform.

At this point it looks like you are creating a regular page, as you don't see any options for adding form elements. That will come after.

In this screen just do the following:

  1. Unit or Group field = Select the group this webform belongs to
  2. Title field = enter a title
  3. Body field = enter any descriptive text you wish to add
  4. Click Save