Connect your Tally to Biz Analyst by following instructions here.
If your Tally is open and the port number is set to 9000, Biz Analyst Application will automatically detect and save the configuration else you will need to put in your appropriate port number.
Open your companies in "Tally" which you want to sync to your phone.
Still facing issues connecting Tally with Biz Analyst? Refer to the following solutions: