3
If this is the user menu you want to display one link on a line, the usermenu template should have an id attribute so the answer lieas in the css file of the theme.
You probably need something like this:
#usermenu a {background-color: transparent; display: block; margin: 0; padding: 2px; font-weight : normal; color:#181818;}
the display:block property is what you need to achieve your desired result.
To show you what i mean heres 2 screenshots
no display:block
has display:block
is this what your trying to achieve?