The edit filter is an automated filter which prohibits certain edits which are considered likely to be spam or vandalism. If your edit is caught by the edit filter, you may wish to consider rewording your edit in such a way that it is not caught.
You can view the configuration of the abuse filter here, although the details of some rules are hidden from view for non-techs (for privacy reasons, or to make it harder for would-be spammers or vandals to work around them).
If all else fails, please report your difficulties to RationalWiki:Technical support. If you notice repetitive spam or vandalism for which you think an abuse filter would be useful, please make your suggestions on that page also.