I. You need the program first (Cheat Engine 7.1) either start it before launching the game or after. If you have launched the game (I would also go into the gameworld immediately) you need to select the process in Cheat Engine by clicking on the blinking button in the top left of the Cheat Engine window.How does one use this cheat engine, am new to this.
II. Make sure to gain 1 level so you have 3 attribute points when sitting down at a campfire and select "level up" (as in e.g. Dark Souls basically, if you ever played that). Before allocating any of your points tab out again to your Cheat Engine Window. You will see the buttons "first scan" and "next scan" as well as the empty line below those. In that line type "3" and click on "first scan", wait until it is done scanning.
III. Go back into Carnal Instinct, spend 1 point (only 1) but do not finalize the changes, just spend the point. Go back into Cheat Engine, replace the "3" in the search line with "2" and click on "next scan", wait until it is done scanning, go back into Carnal Desires, spend another attribute point (just as before don't leave the level up screen), replace the "2" with a "1" and click "next scan" once more.
IV. There is a good chance the results will still be too many things so go back into Carnal Instinct, remove 1 of the points you've spent, so that you go up to 2 spendable points again, go to Cheat Engine, replace the "1" with a "2" and click on "next scan" and the result should be only a few. If you then go back into Carnal Instincts and remove the final point you've allocated (so your points go back up to 3) you can go back to Cheat Engine and you should see that 1 of the addresses you've found before has the value changed from 2 to 3, it will be red, so you should be able to identify it easily. Ignore anything that constantly changes the value while you are in the window & instead choose the address that changed to 3 and that remains at 3 while you look at the window.
V. Double click that address and it will appear in the field at the bottom of the Cheat Engine Window. There you can either edit the value "3" into something higher, or (as I did it because it's easier) check the box "active" because that will make it so the value doesn't go down to 0 when you spend points in the game, tab into Carnal Instinct, allocate attribute points as you see fit, once you are satisfied confirm the changes and return to the gameworld that way. While you are standing right beside the fire try to save your game in the menu (press Esc) and if your game saves there (which it might not do at every location during the 1st part of the tutorial, but it should at the first camfire) you can tab into cheat engine again and just close that, don't save when it asks if you want to save the changes made, not sure what that is good for and it's not required for anything relevant to playing with the attribute points.
Edit: if this isn't clear to you I will try to help if I can but I don't think I can explain it in more detail, I've done my best to describe literally every single step.