How do I thead this machine?

Here's your manual! 😎

https://groups.diigo.com/group/foranzischlo62/content/download-manual-for-serge-master-4300-7018858

Google it, as recommended above, then choose a video, put it on, and let it guide you through threading the machine. That's what we did. The diagrams then make more sense, so you probably won't need to thread it with the video more than a couple of times.

if Robyns answer doesn't work, try youtube for 'threading a serger'. Most simple 4 thread sergers are pretty much alike in the threading.

Margie, Robyn seems to have given you the link to the instructions. I've found that if you mark dots on your machine with a permanent Sharpie pen, it is easier to remember if it's a while in between uses of your machcne. Even drawing your own diagram is worthwhile!

For sale on Etsy.

https://www.etsy.com/listing/129899207/sewing-manual-for-sergemaster-4300

Youtube videos

https://www.google.com/search?q=sergemaster+4300+manual&source=lnms&tbm=vid&sa=X&ved=2ahUKEwi_y6j4k4jmAhVSQ6wKHZL6Ak0Q_AUoA3oECAsQBQ&biw=1536&bih=740&dpr=1.25

I recently went on a serger course. I picked up some great tips, follow the order in the manual, which is usually from right to left. Set the tension disks to 0 whilst you thread and then reset to the suggested levels in the manual. When it comes to threading the needle holding a white piece of people behind the eye of the needle which can help you see it.