Smokeless

So I have a 1999 gas gas txt321 I just got it’s my first trials bike and I took off the clutch to have a look at it to make sure it was all sound then when I put it back together it won’t engage or disengage the clutch there seems to be no pressure at all I never messed with the master cylinder or any of the clutch side lines and it was working perfect before I messed with the clutch’s internals is there a trick to it or something I’ve never messed with hydraulic clutches before so any advise would be much appreciated