First thing to do is make sure you get a backup of your database and all the files in your site so that you know you are able to recover it if something goes wrong.
before considering page manager pro, keep in mind it only works with recent versions of mojoportal. You did not mention your version of mojoportal nor version of .net or database in your hosting. I suspect you are using a very old version and have never upgraded. If so then you are likely in need of upgrading as there have been patched security issues in the past. When I first saw you post I was afraid maybe your site was taken over and someone deleted your content. Again with a backup you could recover but ideally you would upgrade to the latest version and then you could consider page manager pro which may help with page management. But the latest version requires .net 4.5 hosting and a database at least as new as sql 2005 sp4.
upgrading from a very old version you would probably need professional help because I don't sense that you have the technical knowledge to do it yourself and you may need to migrate to a hosting that supports .net 4.5 if your current host does not provide that. Joe Davis is my recommendation if you would like help with that.
writing on my iPad from vacation in sunny cancun so forgive any typos