Isleander:
Jamroom (using Ningja skin) does not support iFame or tables, in blogs, pages, etc. Will it at some time?
Jamroom supports iFrames - you need to make sure you've installed the iFrame Control module:
https://www.jamroom.net/the-jamroom-network/networkmarket/116/iframe-control
since iFrames are
very insecure by default they do not work in Jamroom. The iFrame control module allows you to add "trusted" domains that will be allowed to have an iFrame on your site.
After install you also want to make sure you allow "iframe" in your Allowed HTML tags in your Core -> Quota Settings.
Then you can manually add an iframe where needed. Note that there is no "iframe" button in the WYSIWYG editor, so for now it would need to manually be added in. We recently modularized how custom plugins for the WYSIWYG editor works, so I will see if TinyMCE has an iframe control for their editor and see if it could be added in as part of the iFrame control module.
Hope this helps!
--
Brian Johnson
Founder and Lead Developer - Jamroom
https://www.jamroom.net