Wow... you must be a newbie!!! lol... is this your first BB device??? if so, let me give you a warm welcome
If you can not complete the download and it doesn't work and you simply want to delete it then all you have to do is to go to: SETTING-->OPTION-->APPLICATIONS--> RAMBLE.... applications are listed in alphabetical order so go down to "RAMBLE" or whatever you want to remove and CLICK on TRACKWHEEL... you should be able to take it from there.
As far as resetting... I've done it before but I don't remember how to get there... go to SEARCH and put in "wipe handheld." Either that or dl the manual on BB.com