I'm very confused cause it says donation does it mean I have to donate, It's not free, I can't make logos or Youtube banners with the font for anyone personal use only, I can't sell the font and say I made it or what? I really need help.

From what I've seen from a font like Lemon/Milk, it seems that in order to get a license, you must pay a certain amount that is appropriate for what you are using it for. On the creator of the font Lemon/Milk's website, it says to contact him for said appropriate amount in exchange for an invoice that declares that you have permission to use the font.

Hope I helped,
YoutubeArtCreator