Why does my excel do not show option of "insert"? Any idea about this problem?

Answer 1

Is this in reference to the Tab or when you right click?

If it is the tab "Insert" that is missing you must re-add it via the Settings found under File.

File > Options > Customize Ribbon > Insert

From the customize ribbon, you'll see on the right side the main tabs and check boxes. Just confirm the Insert tab is checked, and it will be added to your ribbon.