The always sign is signed almost like fan, but the difference is in how high you make the sign relative to your head: To sign always, form your dominant hand into a fist with your index finger sticking up. Position this hand at the level of your face or forehead, making small circles, like something in the air going round and round.
If you want to sign fan, you would have to make the same motion but higher above your head.
This is an abstract concept, so teach your toddler the always sign in the context of family or group schedules, activities, rituals, or traditions. You can also reinforce with your child that you will "always" love them, "always" make time for them, and so forth.
Teach your child this sign in the context of real-life experiences, relationships, or activities and schedules. It is an abstract concept, so it is best taught to older toddlers.