You can't. The only one who can pursue criminal charges for false allegations is DCF. You can complain to DCF, and if you have independent evidence that rises to the level of defamation, you may be able to file a civil lawsuit. Filing to modify timesharing is a separate issue
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The prior answer is correct in that you cannot initiate criminal charges for false reports to DCF or the abuse hotline. Under sections 39.205 and 39.206, Florida Statutes, a person who files false reports is subject to criminal charges and administrative remedies (up to $10,000 fine). The problem is that DCF rarely ever pursues such charges. One of my clients was recently subject to several false reports, and he could not get DCF to take any action on his own.
I had to contact the Regional Counsel and client service coordinator to get anyone even to review the reports for purposes of whether the mother violated sections 39.205 or 39.206.
One of the potential remedies is that DCF can send a warning letter about false or unfounded allegations and threaten to take administrative action against the mother. But, this is rare.