Thanks "sly 1978".
Passenger's side in front of the rear wheel. I took off the plastic cover under which there was a plastic tray in which the bag was (it was crumbled and cracked) I had to buy a new one with 1.7L liquid. (520 PLN) To remove the cover, unscrew about 3 screws with a key10 and remove the plastic pins from the clips, about 4 pcs. and take out the clips. After unfastening 2 clips they connect the tray and the cover is shiny aluminum heat shield, disassemble two plastic clips with a Phillips screwdriver (I broke them) then turn them 180 degrees with a flat screwdriver, 4 white plastic clips with springs and then the plastic tray will slide down (they are deep hidden by the trough). unfasten the electric cable (pull the tab away from the plug), unfasten the hose (press with two fingers on the side fields, push them inside and pull out the connector). Unfasten the bag connector the same way - After mounting the bag and folding everything, connect the Lexie and program a new bag (I gave the maximum capacity. I was programming the pump replacement because it did not want to move me during the test and after this action it started, I checked if the liquid was dripping from the hose (it dripped) the hose and put together the rest of the covers.) I did 5 more tests and everything works. I had eolys176 liquid, i.e. powerflex, such a brown liquid.
Ps The liquid itself goes to buy a liter for PLN 90, only the bag itself cannot be bought. I thought about replacing it with a juice tube for PLN 6, but I was afraid that the liquid would react and dissolve it. that's why I overpaid for this piece of plastic bag.