You need to set the preload on the cable. Right now the clutch is not disengaging fully .
From under the dash at the top of the clutch pedal there is a nylon quadrant with a bunch of little teeth on it. It will look like the picture.
Push the pedal to the floor and note the movement of the quadrent gear ( its the one that pulls the cable ) With the pedal to the floor you need to find a way to hold this in place , usually there is a little hook that you can press up to hold it, but a big screw driver works as well. You need to hold this in place while you lift the pedal up , you will hear some clicks . You want about 3 clicks , then you can realease the gear and allow the pedal to return to the up position. This sets the preload on the throw out bearing. It will alleviate all that rattling and noise and at the same time will set the pedal position. The more clicks you move it up the sooner it will fully disengage the clutch from the flywheel. Be careful that you don't over load the tob, other wise your clutch may slip I always start with 2 clicks , if it still is hard to put in gear repeat and do 1 click at a time till it will fully disengage and slips into gear easily.