I'm stuck with step 6 ("To create a custom map type, click Formatting, expand the Map section, and then Plus Sign next to the Map Type property") because there is no plus sign I could click. Am I lacking any permissions?

I'm trying to create a new playground, but am unable to do so.  When I try to select create new trailhead playground, nothing happens.  The list doesn't even register that my curser is hovering over the options in the list.  What am I doing wrong?