Not a dumb question at all. There is a drain plug at the bottom of the trans that probably has a 3/8 or 1/2 square center like on the diff. You let the oil drain then there is a fill plug on the driver side and you add oil till it starts to come out the threads (service manual calls for 2L to fill). As long as you're talkin about the third pedal sticking to the floor then no it wont have something to do with the brakes. The clutch pedal has a spring on it to help with pushing the clutch in and to return the pedal, a leaking clutch slave cylinder can also inhibit it from returning. Here's a pic of the trans plugs hope it helps (B is drain A is fill).
sorry for the size