If your item doesn't release one of two things has probably happened.

1. Your item was too big or broad, and is probably made up of several smaller (releasable) items.  And if this is the case, just look the item over, looking for the smaller, more confrontable items that make up the item you are trying to release.
2. There's one or more deeper/underlying items, related to the item that won't release.  If this is the case you will be able to see the underlying item(s) before long as you do the process.  When you are ready, you can shift to the underlying item.

The video explains this a little more.