• If you are the Discord server owner:

Click the channel name and find the ‘Server Settings’

In ‘Widget’ tab, you will find the ‘SERVER ID’ field

Copy the SERVER ID.

• If you are not the Discord Server owner:

Click the ‘User Settings’ in the left-bottom

Find the ‘Advanced’ tab, and switch on the ‘Developer Mode’

Right click the channel name and find the ‘Copy ID’.

Copy the SERVER ID.