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


[![Sign up via provider for New User](https://img.youtube.com/vi/jLkOntdaigE/0.jpg)](https://www.youtube.com/watch?jLkOntdaigE&feature=youtu.be)


* 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:

[![Sign up via provider for New User](https://img.youtube.com/vi/cRVMnfTpoJw/0.jpg)](https://www.youtube.com/watch?v=cRVMnfTpoJw&feature=youtu.be)

# 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

[![Sign up via provider for New User](https://img.youtube.com/vi/rnPGQUCQ1lc/0.jpg)](https://www.youtube.com/watch?v=rnPGQUCQ1lc&feature=youtu.be)

# 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

[![Sign up via provider for New User](https://img.youtube.com/vi/vyU7nam-bcc/0.jpg)](https://www.youtube.com/watch?v=vyU7nam-bcc&feature=youtu.be)

# 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

[![Sign up via provider for New User](https://img.youtube.com/vi/4ayNCsd3GL8/0.jpg)](https://www.youtube.com/watch?v=4ayNCsd3GL8&feature=youtu.be)

# 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

[![Sign up via provider for New User](https://img.youtube.com/vi/FHkHYDq_Dgk/0.jpg)](https://www.youtube.com/watch?v=FHkHYDq_Dgk&feature=youtu.be)

# Log Out

User can log out via public labs by clicking on the ``log out `` button available on the header of www.publiclab.org