Sorry, at this point I am confused as to what the source of your confusion is.
"A folk witch can bind an animal to herself as a familiar. This is a laboratory activity and takes one season. In order to bind an animal, her Animal Ken Lab Total must exceed the Binding Total" (HMR p. 42.)
"A folk witch can create a Longevity Ritual for herself using the same rules used by a Hermetic magus (see ArM5, page 101). Use her Healing Ability Lab Total for this activity..." (HMR p. 41-42)
Familiar binding for Folk Witches is explicitly tied to their Animal Ken ability, and their Longevity Rituals are based on the Healing ability.
That Animal Ken itself has no description of this possibility on its own is because it was first created for the Core Book, a variation that a Hermetic Wizard might learn/be born with. It is worth remembering that any Supernatural Ability that Folk Witches have WILL be different from the base, as they use their own methods, grounded in their own theory of magic. No other practitioner of Animal Ken (or other abilities) can do with it what the Witches can.
As for Healing, its merely the case that its use is split across the chapter; you get its more immediate usage (Incantations method) first and then the rest that is covered by Lab Activities (Potions & Longevity)
If you think its unclear if UnGifted Folk Witch can create Longevity Ritual or bind a familiar without having relevant Virtues, here is a quote from the Corebook:
"Characters cannot use Supernatural Abilities unless they have at least one experience point in the Ability. Only characters with the relevant Virtue, or The Gift, can put experience points into Supernatural Abilities." (Core Book p.62).
There really is no need to keep pointing out you need an ability to use a certain Lab Total, merely enough to establish the outline/precedent. I mean, there is even the quote on page 38, as outlined by Temprobe.
But as said, Hedge Magic book is not the best written at times, no denying that, but you can often enough infer things from what you have.