Hi, Welcome to the Forum vinitapoojary!
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
trying to load some presets : : I'm on a Mac.
On MAC not all presets are supported. You cant use VST, and Soundfonts!
The default file-format for LMMS presets are
.XPF
XPF-files are natively supported.
On your MAC, find the folder
Projects, in that folder, you have a folder named
Presets -
Thats YOUR presets, those you made, or got from others!
LMMS also have a collection of factory-presets, but YOURS 'should' be kept with your projects.
I hope this is also true for MAcs........