I have a Bernette 334D serger - I'll make a guess that your 335DS is similar.
There is a manual for your model for sale on
www.ebay.com right now, item number is 150565998515.
Assuming your needle assembly is the same as mine, you switch off the engine, turn the flywheel until needles are at the highest point, then take the green small straight blade screwdriver from your machine kit and use it to unscrew (righty tightly, lefty loosey) the needle screws a little (never unscrew all the way out!!!) so you can remove the needles. I use my tweezers for this job as it makes holding the needles easier. You may also want to unclip the pressure foot and raise the upper blade out of the way for a bit more room.
Then slide a new needle into each holder, flat shank to the back and tighten up the needle screws again. Remember that the two needles sit at different heights from eachother so make sure each goes fully up into the needle seat, then retighten with the screwdriver.
I hope this helps you with your Bernette, I've had my 334D since 1990 and its still going strong.
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