Can i adjust the clutch or do i have to replace it

The clutch on that vehicle is hydraulic so cannot be adjusted. Did you disconnect the gearshift cables?
try these web links.
https://youtu.be/sheTKD03hmo


https://youtu.be/7HBE5vycg-4

If you are getting that amount of slippage, it is unlikely that a simple clutch adjustment will cure it. Your clutch pedal should have roughly 1" of free play from the top of the clutch pedal, and absolutely no more than 2" free play.
If you have zero free play, it "may" be possible to eliminate the slippage by adjusting the clutch, but you would have to be very lucky to get off that easy.

The slippage means that your clutch disc is most likely worn too thin and possibly glazed, as well as glazing of the flywheel and pressure plate friction surfaces. When the pedal is released, the clutch engages by sandwiching the clutch disc between the flywheel on one side and the clutch pressure plate on the other side. Strong springs in the pressure plate keep the clutch disc tightly sandwiched between the flywheel & pressure plate. Pushing on the clutch pedal releases this tension/pressure.

It's never "just a flywheel". That mechanic is bogus. All 3 parts are affected by worn or slipping clutch. Usually you don't need a new flywheel, as resurfacing it is usually fine & the normal procedure.
But you will need to replace the clutch disc and pressure plate anytime the flywheel is resurfaced.

Resurfacing a flywheel is similar to resurfacing brake rotors on a brake pad replacement (brake job).
Naturally the transmission has to be removed to get access to the clutch components, which is really the biggest part of the job.

Here's a pic of the basic clutch components:
Please rate via the helpful button if this helped in answering your question, or feel free to ask if you need further explanation.

No it canot be adjusted , I have a 2000 hyundai elantra , As my winter car end the clutch went on it i just replaced it a couple of days ago.

here's what you can do to fix your clutch.

1. if your clutch still uses clutch cable (there is a cable between the transmision and the clutch pedal), the you can adjust the clutch release by tightening/loosen the clutch pedal. adjustments can be done on the transmission side of the clutch cable.
2. hydrovac clutch with self correcting feature. just pull your clutch pedal for a few seconds and check if the clutch release changes.
3. hydrovac clutch without self correcting. between the clutch pedal and the clutch master, you can see a piece of metal rod that connects the 2. this metal is called push rod. there are screws/nuts at the clutch pedal to adjust this push rod. just adjust this screw to your prefered clutch release.

have you replaced your fly wheel and release bearing when you changed your clutch disc?

if yes, then replace your transmission fluid.
also, if you know hot to adjust your clutch release, adjust it. adjust it in a way that you need to draw back your clutch pedal a little higher for the clutch to complete engage.

here are some ways to adjust your clutch.

1. for clutch using clutch cable. open your hood, locate for the transmision, and there you can see a cable that connects the transmision and the clutch pedal. loosen in up a little.
2. for hydrovac clutch with self correcting features. just pull your clutch pedal away from the floor for a few seconds and its done.
3. for hyrovac without self correction. manually adjust the push rod (metal rod that connects the clutch pedal to the clutch master)

The whole idea behind the Hydralic Clutch is there is no adjustment.If the clutch is slipping then you need a new one.If you are having trouble getting it into gear then you may have a bad clutch master and or slave cylinder.Let me know if i can help.

Your clutch is worn out if it releases at the top, when you replace the clutch you will see it engages closer to the floor board

sounds like you may be able to adjust the clutch and correct the problem, look at the clutch cable and and adjust it some and see if it helps, if it does then adjust it til you feel it is right.

If the clutch is slipping, you have to replace it. :-(
There is nothing to adjust. Make sure you get the whole set, including the pressure plate/springs.

first i would try adjusting the clutch cable because commonly people with think that they're clutch is going out when really just the cable has gotten stretched....try adjusting that first and if that works then you should be fine for another couple thousand miles but if you want to not have to worry bout it for awhile i would just replace teh clutch assembly....usually ranges from $200 to $450 depending on the clutch set and the mechanic that does the work for you. Let me know what happens. :)