Typically you click the link that goes to the download link for the zipped map, click the download in the upper right, then extract the contents into the "FPVFreerider_Recharged_Data" folder. The location of the { FPVFreerider_Recharged_Data } folder can be found by right clicking the game shortcut and choosing "open file location", I usually just drag the zip of the map into FPVFreerider_Recharged_Data then right click it and choose "extract here" option. When you are done with that launch FPVFreerider and go to the Level editor, level tab on top right, find it in the list, load it and then play it.