First,
Make sure you have installed the package by going to Dashboard> Packages> and then installing the packages you want to use from there.
Then navigate to the page you want to edit. click the 'edit page' button in the top left hand corner of your site. After page loads in edit mode click the area (outlined in red) that you want to add your package to. this will give you a a few options. choose 'add block'. this will give you a window with all your available blocks. scroll to the bottom of the list and you should find your newly installed packages/blocks there. Click the block you want to add, the rest is pretty self explanatory. When you're all done make sure to exit edit mode by clicking the 'exit' button in the top left hand corner.
This should do it.

I'm having a similar problem. I installed the package. It installed fine, no errors. I go to the page I want to show the package and it isn't in my list of blocks. I see it on the Add Functionality page. Any ideas?

try uninstalling it, clearing you c5 cache from the /dashboard/settings section, making sure your permissions on the /files/ directory is recursively read/write enabled, and reinstall.

Thanks for the reply Tony. I followed your steps and it still doesn't show in my list of Blocks

not sure what to tell you then. is your site in development mode? (so you can see any errors that might be there)

what is in the controller.php of your package

My site is in Development mode and I'm not getting any errors.

Is there something specific in controller.php I should be looking for?

+1. Having the exact same problem.

I have been searching the forum for almost an hour and I can't find any solution working for me.

FYI, a solution involving the php property "set_magic_quotes_runtime()" has been suggested in another thread, but doesn't work for me:http://www.concrete5.org/index.php?cID=176059...

Good luck with it. The more I read, the more it seems several people are having this issue, and it's often misunderstood as an inability on their part to install add-ons...

Another thread about this same problem:http://www.concrete5.org/index.php?cID=157069...

Interesting. Most of the time when people ask this question it makes no sense but I think I finally understand what you're talking about. I think I have fixed this problem in the core by back-porting a bug fix made to our included ADODB database library. If you go to github.com/concrete5/concrete5/ and download web/concrete/libraries/3rdparty/adodb/adodb-xmlschema03.inc.php and replace the corresponding file with that file, let me know if that fixes the problem.

Thanks andrew for your super fast reaction.

Replacing adodb-xmlschema03.inc.php didn't do the trick for me, but there are other things that I haven't tried to solve my problem yet, so it doesn't roll out your solution.

Interestingly, someone has already suggested a fix to this problem based on the same file you modified. See this thread:http://www.concrete5.org/community/forums/installation/add-on-block...
I haven't tried this manual modification yet. I don't know if it's the same as the one you made, but I'll try right now.

Ah! I solved it.

More info on this thread:http://www.concrete5.org/index.php?cID=157069...
And this one:http://www.concrete5.org/index.php?cID=182485...

Thanks anyway andrew. I don't understand why I don't need your fix, but it seems that other people out there could use it!