Ok we have established it is syncing OK, so now have to get it setup to shoot. You will need to shoot with manual flash, that's the only option available with your trigger. This means you need the LH dial turned to "M" and you set your power with the RH dial. You have no magnet in , so that indicates to me the unit is delivering a pre-flash as well, but that's fine it will operate fine with a pre-flash and no magnet.
Next step is to setup to shoot - I assume you are shooting macro based upon the image. Put your camera in manual exposure and start with 1/160 and f11 as a starting point and base ISO and the strobe set to -1 which is half power. find a small subject to shoot, a toy figurine or something about the size of the expected subject and set it up about 300mm away from the port, Set your flash in position on the arm - this link shows your positioning. https://www.opticaloceansales.com/files/OOS-Strobe-Positioning.pdf
Take a test shot and review exposure if it's under exposed check that the flash is hitting to subject, you might need to tweak the angle a little. If it's still under exposed increase the ISO as needed to get the right exposure.
Also be careful with shutter speed the manual states that the trigger will fire even if the flash is set to off - so it looks like the camera doesn't know the trigger is there and may well attempt to trigger at higher than 1/160, you can test this out of course.
Let us know how that setup goes