docs(en): Add info on how to get admin rights in pleroma

content/en/docs/Services/pleroma.md

@@ -5,11 +5,11 @@ description: >
   Decentralized Social Network Server
 ---
 
-Any centralized social network will have to take care of moderation, censorship, 
-implementing rules, reading your correspondence as it grows. 
-Another thing is your own social network, which can only belong to you, 
-your family or your team. Only a decentralized network can provide maximum privacy. 
-That's why we offer you to become part of the Fediverse decentralized network. 
+Any centralized social network will have to take care of moderation, censorship,
+implementing rules, reading your correspondence as it grows.
+Another thing is your own social network, which can only belong to you,
+your family or your team. Only a decentralized network can provide maximum privacy.
+That's why we offer you to become part of the Fediverse decentralized network.
 
 At SelfPrivacy we use [Pleroma](https://pleroma.social/).
 
@@ -24,4 +24,15 @@ At SelfPrivacy we use [Pleroma](https://pleroma.social/).
 
 ## Features of Pleroma
 - A social network of any scale: from a personal server with a single account to a massive thematic site;
-- Your social network, your rules. You are the censor, moderator and administrator.
+- Your social network, your rules. You are the censor, moderator and administrator.
+
+## Getting admin rights
+
+Right now you can get admin rights only by using the command line.
+
+1. Connect to your server via SSH as a `root` user. Use [this guide](/docs/how-to-guides/root_ssh/) if you need help.
+2. Run the following command, replacing `<username>` with the username you want to make an admin:
+   ```
+   sudo -u pleroma env RELEASE_COOKIE=/var/lib/pleroma/.cookie pleroma_ctl user set <username> --admin
+   ```
+3. Done! Now the user `<username>` has admin rights.