I set this to be the same as my body weight or 4 kg less, but it doesn't go down at all. The knee support plate ㅜㅜ So when I set it to 30 kg, it goes down, but it doesn't come back up. Is it supposed to be like this? My body weight is 44.
If you pin it with the same weight as your body weight, it obviously won't go down. A pull-up is not about pushing down; it's about pulling up. Thinking of it as a scale makes it easier to understand. Not being able to pull up is due to a lack of technique and strength. If you build a bit more strength in your arms and back and use straps, you'll be able to do it soon.