To give link share point site to internet explorer without username and password in office 365

Hi

I am using the share point online in office 365. I have created the simple  site   and I have given the link  home page as default site to internet explorer  . But all the time  when I open the IE , it always asking office 365 username, password. How can open share point site in IE with stay signed in my username ,password.

Regards

Pol

polachan