my manual pt cruiser is jumping out of 4th gear and reverse is starting to judder

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hi i have a 06 manual 2,4l pt cruiser here in the uk which i love but this week it has started to jump out of 4th gear and been aquward to get into reverse . before this it the gearbox has been getting sticky to get into the other gears and today it started to make a bit of a rattling sound in nutral . i have heard the bushes on the gear linkage can wear , do you think this may be the problem? + can anyone tell me where to top up and chech the transmisson fluid on a manual box. would be greatfull for any help . thanks