Do not remove the normal Streamcord bot from your server. As of now, the PTB dashboard relies on the main bot in order to communicate with Discord. You should keep both bots in your server if you want to use PTB features.
The PTB bot uses a different dashboard link.In order to manage notifications and Live Role configurations, you can visit https://ptb.streamcord.io. Note that this version of the dashboard can only manage the PTB bot in your server. It also does not implement the dashboard rewrite yet.