From your link:
Move a trackable to your collection
On the trackable details page, select Edit This Trackable.
Check the box Make this Trackable collectable.
Select Submit Changes.
Move the trackable to your collection:
From the trackable details page: Select Move To Collection under “Actions”.
From your Inventory: Select Move To Collection.
Move a trackable out of your collection
From your Collection: Select Move to Inventory.
From the trackable details page: Select Move To Inventory under “Actions”.
If you set a trackable status as collectible, another geocacher can grab it and move it into their own Collection. If you want the trackable to move, set the status to non-collectible.
Sooooo, I edit them to collectable, I will get a choice under "actions" to move to my collection, then move out of my collection to my inventory. Yes? Sorry if I seem dense, but I've never dealt with collectables...
Thank you so much,
Ray