Good question, because reconnecting an account is very easy but tricky. To reconnect an account, please, do the following:
Do not disconnect your current account with invalid credentials!
- Click the Add Data Store button
- Go to Connect data store section
- Select the type of account you would like to reconnect. If you would like to reconnect your Gmail, select Gmail → Connect
- Input the necessary login and a new password. The invalid credentials will be updated.
We will improve this reconnecting tool soon!