The best Login page for improveit 360 is https://login.salesforce.com/. You'll want to bookmark this page. If you have any other Saved Bookmarks, be sure to replace them with this login page.
If you need to Reset your Password, follow along with this Reset Password Article.
Forgot your Password Not Working? – follow along with this Article to resolve this issue.
I cannot access the Email address where the Password reset is being sent. Follow this Article to change your Email address.