every users redirect to specific pages in sharepoint 2010

hi

i create the custom login webpart in sharepoint 2010 via this link

http://csharpdotnetfreak.blogspot.com/2012/08/custom-login-web-part-in-sharepoint-2010-forms-based.html

i have several groups and diffrent users in them and also diffrent pages

for examplae the users are students, managers, parents.......

i want when they click on the login buttom they redirect to the related page

for example student redirect to student pages

managers redirect to managers pages 

etc

my problem thet i don't know how do this work and the  disaster is that i'm not a professinal developer

pls help me

thanks a lot