Warlock Spells in Druid Subclass Help

I'm trying to create a homebrew Druid subclass that, at 14th level, adds Conjuration, Divination, and Necromancy spells from the Warlock spell list to the Druid spell list. When I Googled the topic, it said to create the feature, then scroll to the "Basic Information" section. I cannot seem to find exactly what Google's AI is talking about. Could someone please enlighten me? Currently, my solution is to go to the Spells page, add the Warlock Class and the Conjuration, Divination, and Necromancy schools, set it to consume spell slots, count as known spells, and not always be prepared (Yes/Yes/No, essentially), and then checking the "is infinite" box. If there's a better way of doing this, could someone please let me know?