add instructions for resetting password (#374)

docs/index.md

@@ -19,6 +19,7 @@
 - [Database Information and Maintenance](./db-maintenance.md)
 - [Issues with CAPTCHA](./captcha-bug.md)
 - [How to setup Anti-Captcha](./anti-captcha.md)
+- [How to reset a user's password](./reset-pass.md)
 
 ## For Developers
 

docs/reset-pass.md

@@ -0,0 +1,25 @@
+# How to reset a user's password
+
+Resetting a user's invidious password needs you to edit the database.
+
+Firstly, generate a bcrypt-encrypted hash for the new password you want to set for the user.
+
+This can be done with the `bcrypt` python module, though there are other ways of doing the same.
+
+```
+python3 -c 'import bcrypt; print(bcrypt.hashpw(b"<INSERT PASSWORD HERE>", bcrypt.gensalt(rounds=10)).decode("ascii"))'
+```
+
+To do so, first attach to the database:
+```
+# su - postgres
+$ psql
+postgres=# \c invidious
+```
+
+Now, run the following SQL query:
+```
+UPDATE users SET password = 'HASH' WHERE email = 'USERNAME';
+```
+
+After that, the password should be reset.