Some guide:

1. Create a bot in telegram using the official bot (use bot to create a bot) @BotFather

2. Get the bot token in telegram (copy it).

3. Start the server once with the plugin ( plugin requires PlaceHolderAPI).

4. Open the config in plugins/TelegramSRV/config.yml

5. Place the token you copied in step 2 into "token"

6. In telegram you need to create a group, add a bot (in group settings --> Add Members) and give some permissions.
6.1 In Add Members you need once add a bot with name @getmyid_bot
6.2 Get from the added bot @getmyid_bot a message with chat ID: CURRENT CHAT ID (NOT USERID)
6.3

7. Delete the @getmyid_bot because it needs only for take a chat_id

8. Put a CURRENT CHAT ID in config in plugins/TelegramSRV/ config.yml in "chat_id"

9. Restart the server and enjoy