Your plan sets how many trading accounts can be switched on at once (Starter: 1). Switched-off accounts stay saved.
Use another account
Open Trading Accounts → the account you want → switch it on. If your plan's limit is reached, PipSync offers Switch off "…" and use this account: it switches the other account off and this one on in one step. Then link the account to your channel in the channel's settings.
If you add an account whose number already exists in your workspace, open the existing one under Trading Accounts and switch it on instead.
When an account does not connect
The account card shows its state in words: Connected, Connecting…, Not connected or Switched off. When it is not connected, the card shows the saved MT5 server. The most common cause is a server name that does not match the one in your MT5 login window exactly (for example "Deriv-Demo" vs. "DerivBVI-Server-02"). The server of a saved account cannot be edited, and retrying reuses it: delete the account and add it again with the exact server, then link it to your channel again — see Finding your exact MT5 server name.