You have a mocha coffee pot.
Turn on the hob, if it's electric. You want it hot.
Add water to the level marked on the inside of the lower section. Ideally use freshly milled coffee beans and add enough to reasonably fill the filter (which you've now placed in the lower section).
Don't dampen the grounds, it's not necessary. Screw on the upper section, good 'n' tight. (Have a supply of spare rubber rings as these seals wear - widely available, about CHF3.-).
Heat cups.
Allow water and heat to do their business until you hear it pop-pop-pop-popping. Take off the heat and allow the magic to settle.
Don't let it sit on the heat once it's started pop-pop-pop-popping, or you'll get a burnt taste and that ain't allowed.
Your valve on the side is only necessary if there's a block in the filter. It'll trip if necessary and release any pressure. Best to stick around for the first few times you do it
Don't clean with detergent, just rinse. That sweet oilyness coats the metal and keeps the flavour just so. First times you use the pot, pour the coffee out and 'wear it in' so to say.
Mmm, coffee.