Picasa just catalogs photos it does not store them so you can safely uninstall
I don't know why would reseting your password ***** anything? I made an offer to remote connect that was not my full answer I need to see what is happening. You are right you should only use one or the other not both. I think that was just the website communicating with you not an expert...
OK so you just want to remove Picasa right and just use iPhoto?
Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information:
OK I'll opt then. Your question will be open to other experts. Good luck
Yes sorry as you can guess we only get a portion of what you pay and these questions can get quite involved and time consuming. Good luck.