You may want to give more details about what you're trying to accomplish, because...
[user@host]$ ll /bin/su
-rwsr-xr-x 1 root root 30148 Jul 21 19:54 /bin/su
[user@host]$ ln -s /bin/su notsu
So if you're trying to use this to prevent people from running su it's probably not a good idea.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.