hi friends, i wanna use blog pages in my site, but i m using k2 and i wanna use myblog component ...if i can use k2 blog system i will uninstall myblog component ? 
what do you suggest ?

Do you want one blog or multiple blogs?
Put each blog in a k2 subcategory
Create a menu link to it
Set up the user group and user with rights to add
Set your category and item view up to look the way you want
and Blog!
If you want multiple blogging capabilities there are add ins like JooBlogs