Use this link or just search for "Profit Robots Bot". There are some fake bots, so make sure that you are using the real one (like shown on the screenshot).
Start a conversation with Profit Robots Bot. It should reply to you and give you a key. This is your personal key. All messages for that key will be forwarded by the bot into your private dialog with the bot.
You can always use the "Show my keys" buttons to get all your keys (you can have more than one key).
You can regenerate any key. In order to do that you need:
The bot will generate a new key.
To delete key you need to follow the same steps but use the "Delete" button instead of "Regenerate". But only channel/group keys could be deleted.
You can send messages to Telegram channels/groups. Each channel or group will have its own secret key. Follow the next steps to get that key.
The bot will send you a brief instruction and secret code to verify the channel or group.
Click on your channel/group name.
Telegram will show you a window with the information about your channel. Push 3 dots to get the menu and select "Manage group" or "Manage channel".
In the "Edit group" window click on "Administrators".
Push the "Add administrator" button.
Search for "@profit_robots_bot" and select the Profit Robots Bot.
For a group, you may unselect all permissions and click the "Save" button. Close all windows.
The bot will automatically detect addition to the new group and will give you the key.
For a channel leave the "Post messages" permission for the bot.
Close all windows and post the verification code into your channel from Step 1.
The bot should detect the verification code and give you the key for that channel. You can delete the verification code from your channel now.