Which code for which remote?
If it is the a code for a semi-universal TV remote that came with the TV, the use manual will have that.
It it is for a TV code for somebody elses universal type remote, the Viewsonic manual or support cannot help you. Rather, you need to go to the manual or customer support for that remote or their manufacturer/vendor/provider (if it came with a pay TV box), because the code library and entries within belong to the remote manufacturer and their remotes.