Quoteτότε γὰρ ἡδονῆς χρείαν ἔχομεν, ὅταν ἐκ τοῦ μὴ παρεῖναι τὴν ἡδονὴν ἀλγῶμεν· <ὅταν δὲ μὴ ἀλγῶμεν> οὐκέτι τῆς ἡδονῆς δεόμεθα.
For it is then that we have need of pleasure, when we feel pain owing to the absence of pleasure; (but when we do not feel pain), we no longer need pleasure.
δεόμεθα (δέω) can have the meaning of need, but it can also mean lack, which is more in keeping with Epicurean ethics; when we are not in pain, we no longer lack pleasure because we are already experiencing the fullest possible pleasure (as described in Principle Doctrine 3).
As usual, I invite Bryan, Don, and Eikadistes to review my handling of the Greek.
In the meantime, I recommend reviewing page 61 of Don's Translation with Commentary.
Sage advice for the holidays, Kalosyni, which many of us will no doubt consider applying come...January!