There are a few things that may be keeping you from logging in. The best thing to do is check what messages you get when it doesn't let you in.
"Warning! This email address is not associated with our system."
If You're a Student:
If you're a student, you don't log into PLI Connect, at least in that blue section. What you need to do is click the orange "Student & Parent Login" button in the top right. That will bring you to Canvas, where you should be able to log in with your username and password that your school sent you.
If you're a Facilitator:
Check in with your school or district admin. If your school email is not associated with the system, that just means they still need to create your account in PLI Connect.
If you instead see "Password is incorrect, try again," then you do have an account. Feel free to reset your password if need be, with the password reset prompt underneath where you put in your login credentials.
"Invalid username or password."
If you see this while trying to log into Canvas, either your username or password is wrong. Check the login credentials that your school sent you and make sure to type everything exactly the same. If you've lost that information, you can reach out to your school or your class facilitator. They can look up your account and send you your login information again.
Something else to note is that you need to make sure you're trying to log into PLI's Canvas site. If you see something other than "Proximity Learning" on the page, and something other than "https://proximity.instructure.com/login/canvas" in the URL bar, then you will not be able to log in.
If you still aren't able to get in after making sure you're in the right spot with the right username and password, click Tech Support and let the Solutions team know that something is off. When you do so, make sure to include information about yourself so that they know they're looking at the right account. At the very least, please include your first and last name, student ID, and the district you attend. That way, Solutions can quickly and safely find your account and help you get logged in.