Help, front seat won't slide along rails

[Alex5]

So I just noticed my front seat has stopped sliding along the rails forward or back. Seems like its jammed somewhere.

Can anyone give any advice on how to go about fixing it?

Many thanks

 

[jordski19]

Had my forward/back lever come off in my hand the other day. Get your head under the seat and make sure the lever is slotted in correctly on both sides. Theres some guide holes that both sides sit in, if its not seated correctly it wont move the seat at all.

 

[Alex5]

Yea I tried fiddling with it and the whole lever came off , I think I put it back correctly but something is jammed on the rails