1. First get used to the click pedals, exercise the clicking in and out of your feet while standing still. it is important that you always get your feet out of the pedals BEFORE (you stand still after) braking. You can adjust the spring force of the pedals with the allen key screw.
You could also mount the pedals on another bike temporarily to get used to them ( right pedal has right thread, left pedal left thread)
2. Get used to the balance and steering of the rowingbike.
Best way to get used to it is to find a hill where you can roll the rowingbike of or have somebody to push you ( with one finger pushing forward, not holding the balance) while you are sitting on the rowingbike, your feet not yet clicked in. In this way you feel very secure, your feet are hovering just above the ground. Now you can concentrate on the steering and the balance of the bike. It feels a bit different than other bikes, certainly at low speed as the steering damper wants to push your steering bar back in the straight position.
Once you feel comfortable and can do curves to the right and the left click in one foot and repeat this exercise first without rowing, when that is Ok you do it with two feet clicked in. Take your time for this balance exercise, get comfortable on the bike before you start rowing.
3. When you got used to the balance of the bike you can start to make the rowing movement. At the end of each stroke you have to pull back the footslider with your feet in beginning position to make the next stroke. Try to maintain tension on the blue armstroke cable, the steering bar wil follow the footslider. You can start with one foot make a few rounds and later on click in the second foot.
Make sure the blue armstroke cable has the right length, check this when you are standing still and have one foot clicked in. Now roll forward until your clicked in leg is fully straight and lay down with your back in the seat, now the steering bar may not touch your belly, it should be beween 5 and 15 cm distance between your belly and the steering bar. You can adjust the length of the blue armstrokecable by sliding the middle knot to wards you ( shorter) or the forward direction (longer)
During rowing try to maintain tension on the blue cable, also during the recovery stroke, it is easier to steer when there is tension on that cable.
Always keep two hands on the steering bar during rowing, when you need to get one hand off the steering bar that should only be done when you are freewheeling at the end of the stroke so with straight legs and the steering bar close to you. In that position you have control over the steering also with one hand. You may never take one hand of the steering bar during a stroke and row on with the other hand, The front wheel will steer and you will fall down, that is the worst case scenario, please prevent that!!
Please take your time to get used to the bike in these 3 steps, it is really worth it and will give you a lot of rowingbike pleasure :-)