need help modifying navigation/menu bar

I have a menu in my navigational bar area on my website. It fit and looked beautiful until I added submenus. Once I added them, small arrows appeared to the right of all of the items displayed in the navigational bar, which affected the spacing. I want just one line of menu items displayed, but with these arrows indicating that there are submenus, I can’t do that. But even after the arrows are removed, I need to still be able to hover over the items and see the submenu items appear. Please help. I can provide my code if need be. I use the “Personal Portfolio” theme. I hope i’m in the right place and I hope that all made sense.

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