navigation can contain too few items

Hi Tikaram, In navigation block, I can add no more then three menu items. The fourth menu occurs under the first item. Like item 1, item 2, item 3 item 4. And I should like when I can place the fourth item  on one line with the third, like: item 1, item 2, item 3, item 4, item 5. I. cannot out how. Can you please help. Kind regards Hans Hagmeijer