Help:Edit toolbar

In compatible browsers, an edit toolbar may be displayed at the top of the editing window that functions as a typing aid and a reminder of the available functions. You can choose to use the edit toolbar or not; you will always be able to simply type the code directly into the edit box.

The edit toolbar works with the latest version of Google Chrome, Mozilla Firefox, Internet Explorer, Microsoft Edge, Safari, and Opera.

Source editor
If your toolbar looks like this: Then you are using the source editor.

VisualEditor
If your toolbar looks like this: Then you are using the rich-text visual editor.