Samsung Smart TVs run Samsung's own system, Tizen. Apps for Tizen come from Samsung's app store.
LAKSMED on Samsung
LAKSMED for Samsung Tizen is coming soon. When an official release is ready it will appear on the download page and in the Samsung setup guide.
Today: use a streaming stick
A Google TV or Fire TV stick plugged into your Samsung TV's HDMI port runs LAKSMED now. Follow the Google TV / Android TV install guide, then connect your provider.
What you'll need either way
The connection details from your own authorised provider: an M3U playlist, an Xtream Codes login, or a Stalker/Ministra portal.