ZLIB?

At the Pre-Installation page I get the following:

2. Please make sure the extensions listed below are installed.

MySQL: Off
GD: Off
cURL:
ZIP: Off

How do I turn them on? My hosts are nearlyfreespeech.net, if that helps.

Thanks.

According to:
http://example5.nfshost.com/phpinfo
which is linked on their main page, you have support for all of those and you should not be receiving notification that they are not enabled. If you do a quick search of the phpinfo data with what you provided you will see all are enabled on that example account.

Now what they provide is an example account. I would first suggest you create a file named: phpinfo.php and put this in the file: Save it and then browse to it with your browser. Do a quick search of the results of this to see if all the items you have listed are enabled. If not, contact your host to get them enabled.