first insert a VST module in the grid, then go into the VST module using the P-page button (3rd button from the top to the left of your jacks), then use the first encoder to select the plugin you want to load, then press the first encoder. now press the P-page button again and the plugin GUI shows up, and you can use it. of course you will need to patch the VST module in the grid to an output module, before you will get any sound out of it.
plugins (.so files) go into the /presets folder on your SD card. any other folders that are there such as plugins.presets or whatever were created by the software or plugins themselves, so you don’t have to worry about those and just leave them alone. no need to delete them, just remember to put your plugins in /presets.
the /media/linaro … path only is relevant for linux users here who access the SSP’s sd card over the ethernet network via SSH or use the SD card in a linux computer. so just ignore that.