file -> options -> Customize Ribbon -> centang "Developer"
simpan file excel dengan format Excel Macro-Enabled WorkBook (*.xlsm)
referensi =>
https://www.excel-easy.com/vba/examples/background-colors.html
https://www.contextures.com/excelvbatextboxcreate.html
https://www.excel-easy.com/vba/userform.html