This page is about the Multi-Party Authentication System of Public Labs. # Sign Up 1) Sign Up via the sign-up form: One can fill in the sign-up form available at publiclab.org/signup and create his/her account. 2) Sign Up via provider: * Sign up via provider for New User: If he wants to sign up via provider then he/she logs in via his/her provider's account. Then a new account is generated for the user along with the provider's information as user-tag available on www.publiclab.org/profile/user_name page. An email is sent so that he/she can set his/her password. The following video explains well https://youtu.be/5WW1aoLSgf4 * Sign up of existing user: For an existing user, if he/she clicks on Sign Up via providers on the www.publiclab.org then the provider's information is linked to his/her existing account and he/she is logged in. The existing user is checked via the email address in Public Lab database. The following video explains this: https://youtu.be/PukMinoD510 # Log In A user can either log in via username and password or via clicking on desired provider's icon on the header or on www.publiclab.org/login. The following video explains login via provider https://youtu.be/rnPGQUCQ1lc # Linking of providers to the user account A user can link multiple providers to his account by going to the www.publiclab.org/edit and connecting the desired provider. The following video explains this logic https://youtu.be/1XqEbpQjRkg # Delinking of a provider A user may want to delete a provider so he/she can go to www.publiclab.org/profile/user_name and can delete the ``oauth:providers_name:uid`` usertag. The following video explains this https://youtu.be/QKs6l6yTV6c # Linking of account to the same provider again If a user tries to add another account of the same provider then he is notified with a flash message. This logic is well explained in the following video https://youtu.be/KKndhBtvpuo # Log Out User can log out via public labs by clicking on the ``log out `` button available on the header of www.publiclab.org [](https://www.youtube.com/watch?v=5WW1aoLSgf4&feature=youtu.be)