How to fill the water

To open the Rowenta Superpress 050 iron, you should first unplug the iron from the power source for safety. Then, locate the water reservoir button on the top of the iron. The button is usually located near the back of the iron.
To open the reservoir, you need to push the button inward and turn it counter-clockwise. This will release the reservoir from the iron's body, allowing you to fill it with water.
After filling the reservoir with water, you can reattach it to the iron by aligning it with the body and turning the button clockwise until it clicks into place.
Remember to never fill the reservoir above the maximum fill line, as this can cause the iron to leak water or even cause damage to the iron.

There are no user serviceable parts in this device. unplug it for 2 minutes- make sure the reservoir is filled with water, and the power is off- plug it in and turn thee power on- wait for the ready light to illuminate and try to use it.
good luck
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fill water chamber with vinegar and let it sit for 24 hours.
empty vinegar - fill with distilled water - turn on and press the steam button to clean the holes in the plate of mineral deposits which accumulate from using tap water. after a few shots of steam all should be clear - empty and refill with distilled water and it should be good to go.

No need to open iron! You just unplug the iron. Hold the iron upright. Using a clean cup, pour water into the "open" WATER FILL HOLES just above or in front of the Temp. Select Dial. Watch the water window on the left. When water level reaches MAX, you are filled. Plug in and use. Refill as needed. Ref. - Page 8 in the instruction pamphlet.

FOR HOUSEHOLD USE ONLY
FILLING INSTRUCTIONS
1. Place the unit on a stable surface.
2. While holding the water tank with one
hand, move the release lever toward the
power cord.
3. With the reservoir released, pull up on
the reservoir to remove it from the body of
the unit.
4. Turn the reservoir over, revealing the rubber
inlet cover.
5. Open the inlet cover and fill the tank
with everyday tap water (filtered water may
reduce hard water problems).
6. Close the inlet cover and return the
reservoir to its place, making sure that the
reservoir is secure.

Hope this helps! Hal

Looking at the front of the iron there is a spray nozzle and right above it there is a spot that opens to fill with water.

fill with limeaway let it sit for about 2 hours.. empty.. fill with water

got this off the manual for the IS 7800

CLEANING
Remove water container and clean the main unit with a damp
cloth. To maintain maximum performance, your steamer must
be descaled occasionally. The descaling intervals will depend
on the water quality and the frequency of use. The unit should
be descaled at least once a year or every 100 hours of use.
For descaling proceed as follows:
1. Unplug the unit and remove water container from main unit
by releasing container lock and pulling up.
2. Fill it with fresh water and shake vigorously to remove any
scale. Pour out the water and repeat if necessary.
3. Purchase a quality decalcifier agent and follow the instructions
of the manufacturer for the proper ratio of the mixture
to water and use.
4. After filling the water container turn it up and down to
descale.
5. Attach reservoir to unit, plug in and switch on.
6. Let the appliance run until the water container is almost
empty and do not steam any clothing with this mixture.
7. Unplug and detach the water container. Rinse it with fresh
water.
8. Fill water container with fresh water and repeat steps 5 and 6.
Note: If after descaling you believe that there is still buildup in
the boiler, repeat steps 1-8.

Fill the iron with equal parts white vinegar and distilled water. Place an oven rack over your sink and position the iron on top, with the steam vents facing down. Plug in the iron and turn it to the steam setting. Run it until the steam stops.

Fill the Iron with water but keep the water level below the max line. Plug in the iron and set the temp to 6 and stand iron on it's heel and allow to heat for 3 mins. Now unplug the iron and take it to a sink move and Hold the variable steam dial in the CLEAN position. There may be some hissing and spitting while cleaning so be careful. Continue to hold the dial in the clean position until all the water has emptied. If necessary rock side to side and back to front to get all the water out.When finished release the steam dial plug in the iron and heat for about 2 mins to dry out the remaining water and unplug.