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The Main menu can easily be changed in SMF to add additional links to it and modify existing links.
There are generally two types of menus used in SMF. The one type that typically consists of actual images is either the Babylon theme, the Classic theme or likely a theme that is based on one of them. Themes for SMF 1.0 will only use this style as the other menu style wasn't introduced until the new default theme in SMF 1.1 RC2 was released. For information on how to edit this type of menu, see this:
That however, is no longer the most common menu style used in SMF themes. Most themes made now, are based off of the SMF 1.1 "Core" theme, which uses a image-less, tab menu. If you want to edit this menu, the instructions are different from what is above. See the following for how to edit the Main menu for the "Core" style menu: