Just Try the below code its should work. I used Descriptive Programing statements and not need to use object repository
Code:
Browser("micclass:=Browser").Page("micclass:=Page").WebList("html id:=BirthMonth").Select "February"
Browser("micclass:=Browser").Page("micclass:=Page").WebEdit("html id:=BirthDay").Set "4"
Browser("micclass:=Browser").Page("micclass:=Page").WebEdit("html id:=BirthYear").Set "1988"