You'll find Developer Mode in User Settings > Advanced.
Get your Server ID
In the right-click menu for any of the fields you've selected, you'll see the "Copy ID" option. Click it!
Once you've clicked "Copy ID", you'll have the message, user, or server ID copied to your clipboard. You're all set!
Your personal ID
In a server or group, right-click on your avatar from the list with all the users, then simply press Copy ID like in the Server example!
Connect it to your SkyPrivate account
You can connect it quickly in your SkyPrivate account at Settings > Services.