Welcome

Password protection

We never store your plain password. If you forget it, you can recover access via a code sent to your email.

This sign-in only enables access to the Problems Hub. We do not request bank details or payments on this page.

Email address

We’ll use this for account recovery and important updates. It won’t be displayed publicly.

Choose a username

This is what others will see on your posts. You can change your display name later.

User category *

This is for internal record-keeping only and will not appear on your profile.

Create password

Strength

Use at least 8 characters. Stronger is better.

Confirm password

Make sure both passwords match.

Subscribe to development updates (optional).

We’ll email you only when something meaningful changes (new features and important notices). You can unsubscribe anytime.

I agree to keep discussions respectful and academic. Help

Create an account with email and password, then choose a username for your posts.