Routing after login

hi - I have created a new menu item for users to create quick blog posts from the front end. My permissions mean users need to be logged in to post, so when they click on the menu item, it prompts them to login if not logged in. The issue I have is that instead of taking the user to the quick post menu item after logging in, it takes them to the main blog page. If they are already logged in before clicking the menu item it goes to the quick post menu item as expected. How can I adjust routing to take people to the correct page after logging in?

hope this makes sense?

cheers Pete