It is a very good thing that your daughter show sign that she want to try potty. Apply what you did to the oldest one if you can still remember? (it will get back with you eventually if you forgot). Thanks to our library resource. My daughter will turn 2 in another month and she already potty trained. I thought she might be a little late than her big sister but they both are trained around same ages which was 21-22 months old.
What I did was to put the potty where it is easy for her to see and to sit on while she can play and does other things. The purpose is to help her to feel comfortable with it. (At this time try not to force her). Then I get a doll that has a hole in the mouth and another hole "downthere",take off the doll's cloths, use something to drop water to the doll's mouth, press the doll's tummy, let her see water come out of the doll's bottom. While doing it, you talk to the doll and say "Good job! you did it! you want to go pee-pee again, repeat the process (Don't laugh) Wait a few more days then encourage her to sit on her potty and ask :"You want to go. Let's try!" I make a very big deal when she sucess her first try, you know that she got sticker, kiss, and I keep telling her that she now big kid, good bye diapers, I am so proud of her. Hope this work for you too.