UNIX Rights are set by a chmod command *most FTP clients will allow this* and consist of a string of 3 numbers. 777, 755, 775, 744 etc. each number corresponds to a level of access for each group which are in order Owner, Group, Everyone (also know as Others).
r = read access
w = write access
x = execute access (or run, used mostly for compiled or interpreted languages like C, PHP and ASP)
The most common setting is 755, meaning that everyone can read and run anything on the server but only the owner (me) has permission to modify that file/folder.