If you do not have experience installing home plumbing, you should really use the services of a professional plumber like an N9 Plumber for this job. First of all the pipework for the water supply and drainage need to be laid, in accordance with the makers instructions and specification. Once this job has been completed you can move on and place a circle of plumber’s putty onto the base of the bidet tap, and then insert the tap body into the holes. Put the washers with the locknut on the tap body and do up hand tight. Now, use more of the plumber’s putty to go around the underside of the flange for the drain. Use three layers of Teflon tape to cover the last two thirds of the thread. Wrap the tape in the same direction as the nut travels as it is tightened. Put the flange into the drain hole, with the gasket and washer, and then fit the nut. Fit the pop up drain in line with the makers specifications. Locate the bidet in its permanent position, make sure that the drain outlets are aligned. Indicate the locations of the two side-mounting holes by marking through the predrilled holes on the stool onto the floor. Remove the bidet and drill three sixteenth pilot holes at the marks on the floor. Push the floor bolts into their holes. Of course you may need a professional service like N9 Plumbers to ensure the job is done to the current regulations. Make the connection for the supply to the bidet tap, using compression unions. Correctly connect the hot and cold feeds to the correct ports on the tap. Connect the drain by attaching the P-trap. The trap then attaches to a branch line that comes from the wall or even the floor just as for the drain on a sink. Clear any debris in the supply line. Restore the water and check for any leaks. Assemble the bolt caps and thread them onto the floor bolts. “