Our plans can simply recommend attractions that might be a good use of FastPass+, we cannot actually assign or reserve any FastPasses for you. In order to see your recommendations you will first need to input how many FastPass+ you are allowed (3 to start). To do that click the little green plus sign next to the Advanced Options in the FastPass+ window. Then you will select the number of FastPasses. In the Magic Kingdom you can just select 3. For the other three parks you will want to select 2 in Group 1 and 1 in Group 2.
That will populate the suggestions that you can use to help you when making your FastPass+ selections through the Disney website.
For more info on FastPass+, here is our full page on it: https://touringplans.com/walt-disney-world/fastpass
And, if you would like information on how to make FastPass+ through the Disney website we made this video.