Two ways to bid on IPO shares are available:
1. Online mode
Your stock broker website can be used to apply for IPO shares. It is a very convenient way to apply to IPO shares and takes hardly one minute to complete.
Not all brokers offer the ability to apply for IPO's online. Discount brokers, i.e. Zerodha, RKSV etc. This facility is not available.
Not all IPOs can be offered online. As of July 2016, brokers are not allowed to offer online IPO's for BSE SME IPO or NSE SME IPO.
2. Offline mode
The traditional method of applying for IPO is still available. This involves filling out a physical application. Once you have filled it out, you can send it to the nearest collection center. In most cases, this will be the same place you received the IPO application.
You can download IPO application forms from the NSE or BSE websites if they aren't available online.