Thanks for the photos. I adjusted the brightness to be able to read the labels, so pardon the over exposure, but hopefully, this helps.
It appears that you have the second model laser power supply, covered in our LPSU Guide. The last “L” terminal on the third block is unused.
We need the L wire from the middle block connected to the Laser Fire screw terminal and a Ground wire connected to Laser Gnd screw terminal on the lower left corner of the board. Since LaserBoard has its own power supply we do not want 24v or 5v from the LaserPSU. These appear to be connected to the block in the upper left corner of your board (or what you had marked as the PWR plug).
On your LPSU, it appears the orange wire is in terminal 5 on the middle block, which is IN. This will need to be tied to 5v, which is the red wire in the third terminal on the far right block. Note that by doing this, if you ever press a physical test fire button like the one on the LPSU, or you run at 100% power in LightBurn, you are firing at 100% of 100% power, and this will degrade your tube’s life. In the linked post, you can see they soldered these two wires together and prepped to protect with heat shrink:
The 4 pin X and Y motor connections on the upper right side will be wired directly to the screw terminals at the top of the LaserBoard. Check your motor coil pairs to make sure the wires are paired properly to the terminals.
If you plan to use the existing optical endstops and purchased the connector pack & vitamins kit from the list you linked, see the 4 Wire Optical Endstops section of this article: Installing Endstops / Limit Switches
If you also purchased the 2 wire limit switches we carry to replace the existing endstops, that is covered under the 2 Wire Mechanical Limit Switches section in the same article above, depending on which solution you decide to use.
Your machine does not appear to have an mA Meter. We recommend installing it so you know how much power output you are actually using when firing the laser. Set up is covered here: Connect an mA Meter
Any protection switches like your lid safety and/or water sensor should be wired in series to the P (Protection) and G (Ground) circuit on the LPSU and do not connect the the LaserBoard. If you also want to put a potentiometer in, we cover that at the bottom of the previously linked LPSU Guide above, and you can find some reference for both of these installations in this thread as well: Just want confirmation and clarification on PSU wiring before I do something stupid
For the configuration changes to dial in the physics for your machine size, review our Larger Laser Machine Installation Guide.
Let us know if you have any questions.