How to configure the YouTube Field and Mediafront modules?
Edit your textfield (admin/structure/types/manage/media/fields/[YOUR_TEXT_FIELD]).  Under the Mediafront settings Field type, set field type to 'Media' and Media Type to 'Media Content'.

You must create a mediafront preset (admin/structure/mediafront) before you can associate the textfield to mediafront player.

After your preset is setup, go to manage field of your content type (admin/structure/types/manage/[YOUR_CONTENT_TYPE]/display).  For the testfield that stores your media url, set the Format to Mediafrontplayer and set set the player settings to the Mediafront preset that you created.