You need to use VesTige to load the VST into the LMMS.
Go to Instrument Plugins, drag the VesTige to your Sound Editor track list. When opening the Vestige instrument, you can Load any VST by selecting the folder where you saved your VST plugin...Usually it's a DLL file.
Not all VST's are compatible with LMMS,https://lmms.io/documentation/Tested_VSTs so you must be carefull with the one's you chose.
You should know which VST's work with your LMMS version and your respective operating system.