Welcome to TUG. This is a good place to learn.
If you wish to exchange a week at your Massanutten resort, first you join RCI.
www.rci.com
(It is possible you already have a membership, since you mentioned RCI in your post. Do you receive emails from RCI, or their magazine?)
You specify which resort / week / unit size you own. RCI confirms this information with your resort, and also confirms that maintenance fees are up to date. You then deposit your week into RCI. Note: Once you do this, that year's week belongs to RCI. You do not have the option to stay at Massannutten that year.
You will need to let us know how many "Trade Power Units" TPU were given for your week. To get top properties in Orlando, you may need up to 58. To get that number, you may need to combine two weeks (this year's week and next year's week.)
Then you begin searching online to get familiar with RCI's website. You can enter a geographic area, Orlando, FL, or specific resort names/codes. RCI will return the resorts that have weeks available, by check-in date. If you wish a specific check-in date, you may enter that in the filter, and you may also limit the unit size(s) that are displayed.
There are many lovely resorts in Orlando. Hiltons, Holiday Inn - Orange Lake, Wyndham Bonnet Creek, and many more.
If you can stay in a 1br unit, you might be able to match Disney's Saratoga Springs (#DV06)
To maximize your chance of getting the resort you want for the week you want, you
must set up an ongoing search request.
The easiest method is to do a search on the area you're interested in and "hold" any available week. Then go to your account, and "release" that week, but answer "yes" that you wish to continue to search. You may then modify the search request. Remove the "region" information at the top half, and enter the specific resort code and the actual check-in dates you want. For example:
DV06 1/3/2020 - 1/5/2020
Come back and ask questions, as you progress along the steps.