To add option contracts,
1. On your home screen, use the search box to type in the scrip name>space>strike price>space>CALL or PUT>space>expiry date. Alternatively you can also use the tags to filter on options
For example - If you want to add Banknifty's September Call options, type "BANKNIFTY 30400 CALL 09 SEP" in the search box. Similarly to add Nifty's September Put options, type "NIFTY 14150 PUT 09 SEP" in the search box.
2. Click on the + button next to the scrip name to quickly add it to the watchlist
3. Alternatively click on the scrip to view the details page with charts, general info, etc. Click on the + button on the top right corner of the screen to add the scrip to your watchlist