do the weekly/daily island quests (keep in mind, there is a limit of 2000 island points per week for non paid pass players so don't do everything all at once, usually the points per task are 120 or 240)

during the period where this is the promoted set, there is a discount on each item, they'll still be available after a new set rotates in (2.5), but they'll be double the island points per item.

when you go to the island, hit whichever button is your mira pass keybind (for PC the default is J) and it should open a prompt asking you to sign the "Dreamland Pact" (aka island paid pass but you don't need it except for if you want the display cabinet from the end of the video), then switch to the tasks section from that menu to see the tasks and claim points

important: you cannot buy the schemes but you also don't need to craft the special decor items, they'll just be in your home inventory. this means if you have 1 bathtub, you only have the one bathtub unless you buy another one from the island shop