Please help me I have tried to install Mobile Joomla by uploading it in extensions manager. I have never had any problem doing this before with any of my extensions of my site www.worldwideprayerchain.org How can I solve this error:

JFolder::files: Path does not point to a valid folder or the folder has been deleted.
JFolder::folder: Path does not point to a valid folder or the folder has been deleted.
JFolder::files: Path does not point to a valid folder or the folder has been deleted.
Error! Could not find a Joomla! XML setup file in the package.

It seems to me there is something wrong with your zip file. or is it my site itself. Please help ASAP I'd love for my site to become mobile ASAP. Especially because it is quickly growing and expanding!

Thanks,
Greg

Try to unpack MobileJoomla archive to tmp directory of your site (also this is a check that archive is not corrupted) and use "Install from directory" method.

I tried that. Can I give admin rights to my page temporarily? Thanks!

Yes, you can send it via PM.
But 1st of all check that there is no issues installing other extensions (because it looks like problem with permissions of site's tmp directory).