Start with Get new fans → Pre-saves & pre-orders (or Engage current fans → Pre-save push to also draft an email to your list). Then paste your links into the Drop block under Pre-save links and Buy / pre-order.
Where the links come from: - Your distributor first: upload the song a couple of weeks before release so the stores have it. - Spotify: in Spotify for Artists, open the upcoming release and create a Countdown Page, then copy its link. Your distributor's pre-save link works too (DistroKid HyperFollow, CD Baby, TuneCore…). - Apple Music: the upcoming album's link (music.apple.com/…) has Apple's own Pre-Add button. - iTunes / Amazon pre-orders: switched on by your distributor when you upload (look for a pre-order date); copy the store link. - Bandcamp: turn on pre-order on your album page and paste the link.
What happens: fans join first (so your list grows), then tap to pre-save or pre-order. Each fan who does is tagged presave or preorder and moves up a notch on your fan ladder. On release day the buttons become "Listen on…" and "Buy on…".
GrowStoke sees the tap; the store confirms the actual pre-save or sale (Spotify for Artists, your distributor or Bandcamp show the totals).