Greeting's
The first thing you'll need to check is the fluid level in the reservoir of the clutch master cylinder. If it's low you'll need to find where it leaked. Check both the slave cylinder and the clutch master cylinder. Look at the slave cylinder, it's bolted into the bell housing on the transmission, look for any signs of leakage. Look at the clutch master cylinder where it comes through the firewall under the dash, look for leakage there. Check all the lines for leakage. If the fluid was not low, then I would suspect a mechanical problem with the pressure plate, these are a unique design where the release bearing clips into the pressure plate and pulls instead of pushing. If this comes apart you'll be unable to release the clutch. This would require transmission remove to repair.
I hope this was helpful.
Steve

Hello,
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Thank You
Steve