#1… yes the plugins should be extracted before uploading… so you will upload a directory and a bunch of files to the sp-resources/forum-plugins directory…
#2… you can use the rpx (janrain) feature of simple press to enable 3rd party logins… but you must have created an account on janrain first and set up your stuff there… on their configuration page, you need to set up janrain to work with your site… then on forum – components- login and registration you would enter in the rpx data from janrain…
no issue posting a link to your site here… it helps us troubleshoot with you… if you prefer to keep it hidden from others, you can pm us the data – just refer back to this topic so we know what it pertains to…
simple press does not need comments enabled… those are for wp blog posts and have nothing to do with the forum… though you can integrate comments and forum topics if you want – but thats a wholly different issue…
but yes, simple press does not have its own registration and user system… we simply use the already existing structure of wp… so if you want users to join your forum, you need to enable registrations on your forum… if you are worried about these users getting in your admin, you can block that on forum – options – global settings…