1. On your home screen, search for the stock you wish to add. You can use the tags - Equity, Futures, Currency, Options, etc. to filter your search further
2. Click on the + button next to the stock name to quickly add it to the watchlist
Alternatively click on the stock to view the stock details page with charts, general info etc. Click on the + button on the top right corner of the screen to add the stock to your watchlist