Need to repair 150 mm drip tubing that feeds my Rose garden. I have the parts need advise as how to?

Not sure what parts you have! If it is just a leak, the best quick fix is electrical tape. The secret to making that last (and it will for years) is stretching it as much as you possibly can as you cover the area that leaks. Make sure the area is dry first and wrap with tape at least 3 inches on each side of leak.