Open the 'Option' in FTPRush (F6 by default) and Look for your 'Data Folder Path' (highlighted in blue on the snapshot)
Then go to this path and enter in the folder 'Style' (you need to create it if it does not exist), it is in this folder that you must put the layouts like that :
Then in FTPRush, in the menubar : Tools > Layout > LoadLayout > choose the one you want