Wrong user file comes up when accessing PowerBook Pro from iMac

When I open the MacBook Pro folder showing on my iMac finder (networking), It shows 3 folders, a user folder which I don't use but which contains numerous files and folders; Macintosh HD which shows as a folder with 3 people holding hands, but can't be opened. Double-click and I get "The operation can't be completed because the original item for 'Macintosh HD' can't be found; and a "Test Folder" which has a DropBox alias which can't be opened, "The folder 'DropBox' can't be opened because you don't have permission to see its contents"

The big problem here is that the userfile I actually use on PowerBook Pro "X," doesn't show. If I open the "X's MacBook Pro" folder on the PowerBook Pro, I have access to "X's Public Folder" which contains a DropBox folder; "X" which is the actual user's folder I want to be able to reach from the iMac; "Macintosh HD" which contains "Applications," "Library," "System," and "Users;" "Users" contains the user folder which shows up on the iMac finder, along with "Deleted Users," "Shared," and "test" which contains unusable folders with a red circle containing a negative sign in the lower right hand corner.

Long explanation, simple question: How do I access the actual user folder, "X," from the iMac?