I can't figure out how to get a queue line to connect to a water slide! I've tried everything, and no one can use the slide! I've had this game for so long and I have yet to use a slide because of this! Someome please help!!!

To add paths to water slides, you need to add them through the Pool Editor - there is a path icon in that window that you use to connect the top of the slide to the pool itself.

Dont use a normal ride queue, use a pool path