Threading is easy, it's just like a Singer 15 or a regular clone.
First the needle goes in flat to the right.
Thread comes off the spool to the thread guide on the top back of the face plate.
Down to the outside of the top tension and around it towards the inside.
Up to the inside of the bent thread guide then around it from the backside to the front.
Through the thread check spring then up to the thread take up lever.
Through the thread take up lever from the back to the front.
Down through the thread guides on the face plate to the needle.
Through the needle from left to right.
There may also be a thread guide on the needle bar, if so through that too.
Easy.