See the steps below.
Explanation:
Click on the new button to select it (or Ctrl+Click, if a macro has been assigned to the button).
Click in the Name Box, at the left of the Formula Bar.
Type a new name, to replace the existing butto name.
Press Enter, to complete the name change.

See the steps below.
Explanation:
Select the View tab, then click Macros > Record Macro.
Macro names must begin with a letter and use either letters or numerals. You cannot use spaces, non-alphanumeric characters, or periods.
Macro names can be 80 characters maximum
Macro names cannot conflict with the program's reserved commands or keywords such as Print, Save, Copy, Paste.
Descriptions are just notes that summarize the macro's function.

See the steps below.
Explanation:
Select the object (table, equation, figure, or another object) that you want to add a caption to.
On the References tab, in the Captions group, click Insert Caption.
In the Label list, select the label that best describes the object, such as a figure or equation.