How do i remove date ,time and comments option in the posts

You can add CSS to hide date and comment links.
#main .entry-header .entry-meta{display:none;}

Under Blue Planet Theme Options -> General, you can Custom CSS box to add additional CSS code.

Thank you very much its solved.i want to know one more thing if i want to hide tags from posts ,it should not be displayed with post but remain in back end so what should i do

Try this
#main article footer.entry-meta{display:none;}

This just hides tags from the front end. You can add tag in the admin side.

Thanks , its working ,your help is appreciable .

Glad to be of some help. ??

hi,
going on from this, how do you make the tags appear on the post, but not on the home page
thank you