> For the complete documentation index, see [llms.txt](https://docs.klai.studio/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.klai.studio/engineering-reference-docs/setting-up-auth0/creating-a-database/choosing-different-login-options/username-and-password-auth0.md).

# Username and password (Auth0)

As already mentioned above, you can link apps to users database under <mark style="color:red;">`Authentication`</mark> → <mark style="color:red;">`Database`</mark>. Another option is to navigate to your application (on Auth0), and under the <mark style="color:red;">`Connections`</mark> tab you will be able to individually toggle the options you want to have enabled for that specific application. By selecting a database connection, it will allow users registered on that database to login to your application using the username and password created under Auth0.

<figure><img src="https://2586933017-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FheC5LgoLOS4Tub2LLUGt%2Fuploads%2F6nhUrtsCanapKkwIS84u%2Fimage.png?alt=media&amp;token=9e3ca499-cbee-4de5-b7f1-de50e10c26d9" alt=""><figcaption></figcaption></figure>