Thank You Note For Reatail Interview Should I Send A Thank You Note After An Interview At Old Navy?

Should I send a thank you note after an interview at Old Navy? - thank you note for reatail interview

Today I have just a conversation that I think it went well. She said I should hear from them within 24 hours. I read that you send a thank you note after an interview. I want a thank you? If so, when and how shall I send? Should I send in the mail or just go to the store and give it to you personally? I only know the names of the interviewer.