I don't know if you're using a different web interface that I use with a regular RCI account. But when I search online, I go to the search page and scroll down to the bottom. There is a place to enter your desired date range and/or destination.
Opens up? RCI is an exchange company not a timeshare management company or hotel chain. They only have availability when other owners or timeshare management companies make deposits. When you get within 60 (45?) days of check-in, they do begin to relax trade power requirements and developer vouchers are more likely to be able to snag a good deposit. By 2 weeks prior to check-in, all available inventory may be confirmed by anyone. But the best deposits are normally already taken looooong before then so you're really just seeking after vacation cancellations by other RCI members at that time. You'll have the best success rate with RCI by seeking something 14-24 months out. II was only a little closer, perhaps 11-24 months out. Exchanging (for good stuff) takes patience, usually getting your request in as early as possible then waiting for months, with uncertainty. Many timeshare owners are unable to make deposits more than 10-13 months out and you want your request already sitting high on the list when they appear. HTH.